Electrician Qualifications

Electricians

Finding a home electrician

Most homeowners call electricians in an emergency or if they’re building or remodeling. It’s important to research a contractor and find a skilled electrician before you need one. By building a rapport with an electrician, you can be sure that they will be there to help when you need their services. So, you’ll want to hire an electrician for regular inspections before an emergency takes place. A good electrical contractor will become familiar with your home’s systems and possibly discover emerging problems before they become major situations.

Hiring an electrician is an important decision because they work with critical home systems that affect nearly every aspect of the building and can cause significant inconvenience, damage or even house fires if the work goes wrong.

As always, homeowners should get multiple bids to ensure they received the best price for the service. To vet the companies, homeowners should ask about the following items:

Up-to-date education: A reputable company will require staff to attend regular training courses and stay current on the National Electrical Code, which is amended every three years.

Pulling permits: A permit is usually required in most counties and from the power company any time you’re replacing a home’s main electrical equipment or doing a significant amount of rewiring. The cost of the permit is often included in your electrician’s bill, but be sure to ask. With the permit comes an inspection to ensure the work meets code.

Legitimate licensing: If your state requires electricians to be licensed, check that the license is current. Poor wire connections, overloaded circuits, improper grounding and broken safety elements on an electrical panel are just a few of the problems that can arise from bad workmanship. To check an electrician’s licensing, refer to the Angie’s List License Check tool. You should also protect yourself by verifying the hold the appropriate bonding and insurance, including general liability and workers’ compensation coverage.

Specialization: Since companies specialize in different areas and scopes of work, it’s important for homeowners to hire the right company. If a homeowner only wants to replace outlets and switches, then he or she probably shouldn’t waste time calling commercial electricians that wire large buildings.

Find out who’s doing the work: You’ll want to know if the electrician does the job themselves, if they employ helpers or apprentices, or if they use subcontractors. In the case of helpers and apprentices, verify that a licensed electrician will supervise them, and in the case of subcontractors, make certain their insurance covers you as well.

Ask about their warranty: Highly rated electricians say a good contractor will offer a parts and labor warranty to show that they stand behind their work.

Most electricians learn on the job through an apprenticeship program of several years, which tends to vary by state. Most state licenses require a certain number of hours of on-the-job training. The path of how to become an electrician depends on several factors, including whether the company is union or non-union, state regulations and the demand for more electricians in that region.

The path on how to become electrician usually starts either with an apprenticeship or a term as an electrician’s helper. Electricians in training observe their mentors at work, take on some of the task, learn the roles of electrician’s tools and take on greater and greater responsibility as they progress. Their salary also increases by year until they’re reader to take the test to acquire their electrical license. They can also undergo specialized education at a technical school or a union training facility, which usually involves matching the trainee with an appropriate electrical contractor.

circuit breaker box with exposed wiring

Familiarizing yourself with home electrical equipment and common problems may help prevent future issues. (Photo by Summer Galyan)

Electrical projects

Unless you know what you’re doing exceptionally well, carefully consider the prospects if you’re planning on do-it-yourself electrical work. You can easily get in over your head, causing costly damage, creating potentially dangerous hazards and run afoul of local or state electrical code and regulations. In general, electricians say you can handle installing receptacles, outlets and lighting fixtures as a DIY job if you have a clear idea what you’re doing, but more complex work requires expert help.

Electrical work covers a wide variety of tasks, ranging from major jobs like home rewiring or breaker box replacement to minor work like installing fans or upgrading electrical outlets with USB ports.

Though the basics of electrical work have not significantly changed in the last few decades, electrical contractors and homeowners alike face new challenges as advancing technology creates heavier demand on electrical loads and presents new opportunities for major upgrades such as home automation.

Electricians can also conduct home electrical system inspections that will identify problem areas, future trouble spots and areas of immediate concern. Such an inspection can take place before you buy a home or any time afterwards to check your status.

Your home may be giving you several clues that you need immediate help from a professional electrician. If you feel mild shocks or tingles from appliances, you may have a ground fault issue that requires attention (although shocks after crossing a carpeted surface aren’t cause for concern.) If your ceiling fixtures are warm or lights are flickering, that may be a sign of loose wiring. Light switches or receptacles that turn on and off at random could be signalling a problem with loose wiring or internal damage. If any outlet emits a burning odor or sparks, shut down the electrical panel right away and call an electrician for help, as you could be at immediate risk for fire.

Many homes built before 1950 contain old-fashioned knob and tube wiring, which is widely believed to pose a hidden risk to homeowners. It was the primary wiring method from the 1880s through the 1930s, and still used into the 1970s for some new home constuction. This form of older wiring creates a risk of faults and fires, and often can’t handle the electrical load of modern houses. How much does replacing knob and tube wiring cost? You can expect to pay between $8,000 and $15,000 for an average-sized home.

Electricians can also install whole house surge protectors for between $300 and $1,000. Whole house surge protection blocks incoming surges at the breaker box and can protect your electronics and appliances from damaging electrical surges if you live in an area prone to lightning strikes.

Older and outdated breaker boxes often present problems such as fire hazards or overloaded circuits. Licensed electricians say a breaker box replacement will range from $500 to $3,000 depending on the sie of the house and the type of box.

Electricians can also install and upgrade outlets for safety purposes. An arc fault circuit interruptor (AFCI) outletcuts off power in the breaker box as soon as it detects a sharp spike or drop in voltage. This prevents dangerous sparks or excessive heat, which is a common cause of residential electrical fires. AFCI upgrades cost about $40 per breaker plus labor, so electricians estimate this work should cost between a few hundred and a few thousand dollars, depending on the scope of the replacement. A ground fault circuit interruptor (GFCI) outlet detects disturbances in current and shuts off electrical flow quickly. This protects against electrical shock by breaking the circuit immediatley, faster than circuit breakers or fuses. They are typcially installed in areas that come in contact with water, like kitchens or bathrooms, but can be installed anywhere. Although they primarily protect against electrocution, they also provide further protection against fires and damage to appliances. A GFCI outlet can normally be identified by the “reset” and “test” buttons on their face.

an open light switch panel with wires

Trained electricians know the significance of electrical wire color codes. (Photo by Summer Galyan)

Types of electricians

Although the study of electrical phenomena goes back to ancient times, it was not until Thomas Edison’s era that electrical currents could be sufficiently controlled to be used in homes.

Edison wasn’t the first inventor to build a light bulb, but he developed the first electric-powered bulb that would actually stay lit and not burn itself out after a few minutes of use. He patented his invention in 1880 and soon afterward founded Edison General Electric.

Many other electric companies quickly sprang up across the U.S. and in Europe as the race was on to generate electricity and disseminate it to businesses and homes. Natural gas light fixtures and kerosene lamps were phased out as the electric networks grew.

This rapid growth also created a demand for a new profession — the electrician. Even today, the job of electrician can be dangerous and even deadly. In the early years there were not yet many safety features, so electrocution and fires were not uncommon. However, today’s electricians , electrical engineers and linemen are extensively trained to provide the safest possible service.

Electricians are trained to recognize a variety of important elements, including staying familiar with the most up-to-date version of the National Electric Code and knowing what the electrical wire color codes mean. Modern-day electricians need continuing training and education. They fall into different classifications:

Residential electricians install, maintain and upgrade electrical equipment in apartments and houses. They may also install outdoor landscape lighting. Their scope of work covers everything from outlet improvements to breaker box upgrades and total home rewirings. They also work on construction jobs to install wiring and boxes in new homes. Many states also have a special subset of electrical contractor license to cover installing home security systems and alarm work.

Commercial electricians work on construction sites, in commercial buildings and on mechanical electrical systems. Most commercial electricians perform some installation work, which may involve water heaters, commercial security systems and electronic key systems.

Journeymen electricians work with mechanical connections, lighting installation, power supplies, security systems and communications in both residences and commercial buildings. Journeymen electricians have completed several years of on-the-job training and acquired the appropriate license in their state. They are qualified to work in a wide variety of electrican contracting tasks and can usually oversee apprentices or helpers. A journeyman electrician may also work on overhead lines.

Master electricians are highly skilled electricians who generally work in a supervisory role or own contracting businesses. Many states require seven years of experience as an electrician or a bachelor’s degree in electrical engineering for certification as a master electrician. Licensing specifics vary by state, but in numerous cases, a business with numerous journeyman electricians must have a master electrician who oversees the entire operation.

What to have in an Emergency Kit

Build A Kit

Make sure your emergency kit is stocked with the items on the checklist below. Most of the items are inexpensive and easy to find, and any one of them could save your life. Headed to the store? Download a printable version to take with you. Once you take a look at the basic items, consider what unique needs your family might have, such as supplies for pets, or seniors.

After an emergency, you may need to survive on your own for several days. Being prepared means having your own foodwater and other supplies to last for at least 72 hours. A disaster supplies kit is a collection of basic items your household may need in the event of an emergency.

Basic Disaster Supplies Kit

To assemble your kit, store items in airtight plastic bags and put your entire disaster supplies kit in one or two easy-to-carry containers such as plastic bins or a duffel bag.

A basic emergency supply kit could include the following recommended items:

  • Water – one gallon of water per person per day for at least three days, for drinking and sanitation
  • Food – at least a three-day supply of non-perishable food
  • Battery-powered or hand crank radio and a NOAA Weather Radio with tone alert
  • Flashlight
  • First aid kit
  • Extra batteries
  • Whistle to signal for help
  • Dust mask to help filter contaminated air and plastic sheeting and duct tape to shelter-in-place
  • Moist towelettes, garbage bags and plastic ties for personal sanitation
  • Wrench or pliers to turn off utilities
  • Manual can opener for food
  • Local maps
  • Cell phone with chargers and a backup battery

Download the Recommended Supplies List (PDF)

Additional Emergency Supplies

Consider adding the following items to your emergency supply kit based on your individual needs:

  • Prescription medications
  • Non-prescription medications such as pain relievers, anti-diarrhea medication, antacids or laxatives
  • Glasses and contact lense solution
  • Infant formula, bottles, diapers, wipes, diaper rash cream
  • Pet food and extra water for your pet
  • Cash or traveler’s checks
  • Important family documents such as copies of insurance policies, identification and bank account records saved electronically or in a waterproof, portable container
  • Sleeping bag or warm blanket for each person
  • Complete change of clothing appropriate for your climate and sturdy shoes
  • Household chlorine bleach and medicine dropper to disinfect water
  • Fire extinguisher
  • Matches in a waterproof container
  • Feminine supplies and personal hygiene items
  • Mess kits, paper cups, plates, paper towels and plastic utensils
  • Paper and pencil
  • Books, games, puzzles or other activities for children

Maintaining Your Kit

After assembling your kit remember to maintain it so it’s ready when needed:

  • Keep canned food in a cool, dry place
  • Store boxed food in tightly closed plastic or metal containers
  • Replace expired items as needed
  • Re-think your needs every year and update your kit as your family’s needs change.

Kit Storage Locations

Since you do not know where you will be when an emergency occurs, prepare supplies for home, work and vehicles.

  • Home: Keep this kit in a designated place and have it ready in case you have to leave your home quickly. Make sure all family members know where the kit is kept.
  • Work: Be prepared to shelter at work for at least 24 hours. Your work kit should include food, water and other necessities like medicines, as well as comfortable walking shoes, stored in a “grab and go” case.
  • Vehicle: In case you are stranded, keep a kit of emergency supplies in your car.

EV CHARGERS FOR YOUR HOME

EV CHARGERS FOR YOUR HOME

Charge up to 3x faster with the smallest portable charger on the market. It’s so easy to use and install that all you need is a 240V outlet. The ideal solution for plug-in hybrids (e.g. Chevrolet Volt, Ford Energi) and many battery electric EVs (e.g. Nissan Leaf, Fiat 500e, Kia Soul, Ford Focus).

FEATURES

  • Charge your EV 3x faster than your Level 1 cordset.
  • Portable
  • UL Listed
  • Built-in security and safety measures
  • NEMA 6P Waterproof Certification
  • Industry Standard SAE J1772™ connector

Charge up to 5x faster with our reliable, safe, and easy-to-use EV charging station. Preferred by leading automotive brands such as Nissan, Ford, Fiat, Mitsubishi, and Kia. Perfect for those all battery electric EV drivers who want to minimize charge time and get back to what’s important in life.

FEATURES

  • Charge your EV 5x faster than your Level 1 cordset.
  • Plug-In or hardwired models available
  • UL Listed
  • Built-in security and safety measures
  • Outdoor rated NEMA 3R Certification
  • Industry Standard SAE J1772™ connector

Electric Vehicle Charging Guide

Electric Vehicle Charging Guide

Would you like to know how to charge an electric car? Charging an EV is easy! You can charge your car at home, at a public charging station or at work. Here is what you need to know before driving to a public charging station:

  • The difference between level 1, level 2 and level 3 charging stations
  • The type of connectors compatible with your EV
  • The charging networks available in the United States and in Canada

With this electric car charging guide, you will learn everything you need to know about charging.

 

This guide discusses 3 key places where you can charge an electric vehicle:

Before we get into those concepts, it’s good to know the various terms used for charging stations. They usually all refer to the same thing.

  • Charging station
  • Charging outlet
  • Charging plug
  • Charge port
  • Charger
  • EVSE (Electric Vehicle Supply Equipment)

Home charging

Charging levels

There are two types of charging at home: level 1 charging and level 2 charging.

  • Level 1 charging happens when one charges the electric vehicle (EV) using the charger included with the car. These charger can be plugged with one end into any standard 120V outlet, with the other end plugging directly into the car.
  • Level 2 chargers are sold separately from the car (although often purchased at the same time). Those chargers need a bit more of a setup, as they are plugged into a 240V outlet, which often requires the work of an electrician.

For any electric vehicle or plug-in hybrid, the use of a level 2 home charging station is recommended to benefit from all the pros of driving electric.

 

Connector types

The pros of home charging

A fully charged battery in a few hours

With a level 2 charger, it takes around four hours to fully charge a 30 kWh battery car (standard battery for full electric cars), which allows you to make the most out of driving your EV, especially when you have a limited time to charge.

Starting your day on a full charge

In most cases, fully charging your car at home will be enough to meet the needs of your daily commute, and then some.

Cheaper charging costs

Another advantage of home charging is the low cost of electricity compared to public charging.

Making the most of government programs

Some governments have incentives in place to make level 2 home charger purchase and installation more accessible.

In the USA, we recommend you to check your government’s website to discover the available subsidies.

In Canada, the following provinces have incentives:

  • Quebec: $350 off the retail price and $250 off the installation costs.

    Public charging

    This section covers the 3 majors aspects about public charging:

    Charging Levels

    Connectors

    Networks



    Charging Levels

    There are 3 standard charging levels to charge your electric car. All electric cars can charge on Level 1 and Level 2 stations. However, some vehicles cannot charge at a Level 3 (also known as a DCFC or fast charger). Knowing your vehicle capabilities is therefore very important.

    Charging Level Summary

    Niveau 1 borne de recharge véhicule électrique illustration

    Level 1

    The Level 1 is the standard wall outlet. It is the slowest charge level. Several hours are required to fully charge a vehicle.

    Level 2 borne de recharge de voiture électrique

    Level 2

    The Level 2 is the typical EV plug you’ll install in your garage for example. Many public charging stations are Level 2. RV plugs are also considered Level 2’s.

    Level 3/ BRCC borne de recharge de voiture électrique

    Level 3

    Finally, there is the Level 3, commonly called the DCFC or DC Fast Charge. These charging stations are the quickest means to recharge a vehicle

    Tip: Charging at a DCFC station is only effective if your battery state-of-charge (SOC) is below 80%. After that point, charging will slow down significantly.



    Charging Station Connectors

    The most common connector is the Level 2 J1772 EV plug. All vehicles can use this connector standard in Canada and USA.

    Where connector standards may get confusing is for Level 3 stations

    One way to remember Level 3 connector compatibilities is to look at the make.

    1. Asian: Nissan Leaf, Mitsubishi i-Miev, etc. These cars use the CHAdeMO connector standard.
    2. American / European: Chevrolet Bolt, Chevrolet Spark, BMW i3, Mercedes, Volkswagen, etc. These cars use the SAE Combo CCS standard.
    3. Tesla: Model S and Model X. Tesla uses its own Tesla connector standard.

    Before driving to a charging station, it is important to know if your vehicle is compatible with the connectors available. This is especially important for non-Tesla DCFC stations. Some may have just a CHAdeMO connector, others just an SAE Combo CCS connector, and others will have both. Also, some vehicles, like the Chevrolet Volt – a plug-in hybrid electric vehicle, is not compatible for Level 3 stations. Make sure you know your vehicle compatibilities before planning a trip.



    Charging Station Networks

    There are many charging networks in the United States and Canada. Not all are present everywhere, but you can often have several in a region. They could be split in two categories:

    1. Smart charging stations, also known as networked charging stations or connected stations
    2. Non-networked charging stations. These do not require any membership to activate

    Charging Networks Overview

    Workplace charging

    How does workplace charging work?

    Workplace charging works very similarly to home charging. It is offered by an employer to their employees. The employees therefore have access to parking spaces with charging stations during the day. These stations are usually level 2 stations, and many regions have incentives in place to encourage their implementation.

    The pros of workplace charging

    A longer electric range

    When combined with home charging, workplace charging can double your daily electric range. This is particularly interesting for plug-in hybrids, as you can use the electric motor for longer distances and therefore save on fuel.

    Level 2 charging allows you to charge faster, which is particularly interesting for part-time employees or for workplaces where employees are not in for the entire day.

    Large fuel savings

    The electricity costs of workplace charging are often taken on by the employer, which means employees can charge at work for free. In other cases, the employer charges fees to use the charger, but the cost is usually lower than that of a public charging station.

    Government subsidies

    In order to encourage employers to install charging stations for their employees, many governments have put in place programs that reduce purchasing and installation costs, as well as different advantages for the employer. However, many employers are unaware of the existence of these programs, and it falls on interested employees to talk to them about it.

15 Things To Do When The Power Goes Out

When the weather is bad–rain pounding the roof, wind shaking the windows, thunder rumbling through the air, lights flickering off and on–you know the power could go out any minute. Other times the power goes out with no warning, and there’s no telling how long it will last.

Most people have a mini panic attack when this happens. They scramble around, looking for a flashlight or candles. Then they check their phones for news, nervously glancing at the battery life icon every ten seconds. Living without power is a huge adjustment.

Even if it’s only out for a few hours, your whole routine is disrupted–no TV, no microwave, no dishwasher, nothing. But as long as you know what to do, it doesn’t have to be a major disruption.

When the lights go out, the following things should be done in order to stretch resources, keep your family calm, and make the power outage more tolerable.

1. Grab Your Lights Out Box

This contains things like flashlightsbatteries, an emergency radio, and so forth. Keep it in a place you can easily find in the dark.

2. Fill Your Tubs And Sinks With Water

This is just in case the power outage is extensive and the water sanitation system isn’t functioning. The water you pull out immediately after the outage will be safe to drink.

3. Unplug Your Electronics

This includes your computers, laptops, gaming systems, cell phones, etc. Anything that has sensitive electronic components should be unplugged to protect it from a power surge when the power does come back on.

4. Go Outside And Look Around

This is to give you an idea of how widespread the power outage is. See if your neighbors have power or not.

5. Call The Power Company

If you’re not sure why the power went out, call the power company. They will often have a recording indicating why the power is out as well as an estimated time before restoration. It may take 15 minutes or so before the recording is put up. You can also check the power company’s website via your smart phone.

6. Turn On Your Emergency Radio

Your local stations will probably announce a widespread outage, but you may need to turn to an AM station for more information. You may also be able to get information from your cell phone if you have emergency alerts enabled.

7. Give Everyone a Flashlight

This way everyone can move around without fear of tripping over something. Glow sticks are also an option. Candles do not make good portable lights and should be left stationary.

8. Light Emergency Candles

Place them in Mason jars or on secure candle holders with a plate or tray underneath. Keeping the candle in a jar prevents it from accidentally being tipped over and keeps the wax in one place. Here are some other lighting options.

9. Keep The Refrigerator And Freezer Doors Closed

The food in the fridge will stay cool for 4 hours without power and the food in the freezer will last up to 24 hours. Once the food in the freezer has thawed, you only have a short while to eat it before it becomes a food safety issue.

10. Eat What’s In The Refrigerator, Starting With The Dairy Products

Save canned foods and non-perishables for last. Once the refrigerator food has been diminished, eat the food in the freezer. Don’t continuously open and close the refrigerator. Grab everything you think your family will eat at one time.

11. If It’s Cold Outside, Close The Doors To Rooms You Won’t Use

Cover the windows with blankets to trap in the heat as well. You may be better off huddling in a small room together with the family. The body heat will help keep the small space warm.

12. Lock The Doors And Bring Your Pets Inside

Sadly, power outages are the perfect opportunity for thieves to take advantage of the darkness. Make sure your home is secure.

13. Keep Your Devices Charged

You might need them for news alerts or communication with friends and relatives. You can use a car charger, or better yet get a solar device charger.

14. Get Your Portable Generator Up And Running

Remember, you should never run a generator in the house as the fumes can be deadly. Also keep in mind that portable generators can only run one large appliance, like a refrigerator, and a few lights at a time. That means you may have to switch back and forth between a refrigerator, a space heater, and so forth.

15. Check On Your Neighbors

Especially elderly neighbors who might not be as prepared as you are. Make sure they have a flashlight, water, and food. Pass along any information you have gleaned about the outage and how long the power is expected to be out. Make sure you check back every hour or so if you’re concerned about their safety.

3 Basic Types of Lighting

The single most important concept in creating a good lighting plan for the home is to use an array of different types of lighting. “My best advice whatever you’re doing, whatever you want to achieve, is to create three layers of lighting—ambient, task and accent,” says Patricia Rizzo of the Lighting Research Center. Too many people make the mistake of expecting one type of lighting to do it all. Each type meets a particular need.

Also called general lighting, ambient lighting provides overall illumination for a room, and is intended to create a uniform light level throughout a space, independent of any special lighting that may be needed in targeted areas of a room. In most home settings, when a person steps into a room and flips on a switch, ambient lighting illuminates the space. Ambient lighting takes many forms, including: ceiling-mounted or recessed fixtures that direct light downwards; wall sconces or floor-lamp torches that wash the walls with light; cove, offsite and valance lighting that bounces light off ceilings and walls.

Targeted to a particular area of a room, task lighting is intended to illuminate a specific function. Areas of a home that require task lighting include kitchen counters where food will be prepared; living room seating areas where reading will take place; and home office desk surfaces where paperwork will be done. In a kitchen, under-cabinet lighting provides task lighting for a counter top; in a living room, a table lamp is often used for task lighting to accommodate reading.

Also called highlighting, accent lighting draws attention to a particular object, such as artwork, sculpture, plants or bookcases. Accent lighting is often used outdoors, to highlight a beautiful tree, plant or water feature, or to draw the eye to a particular area of the landscape. Recessed or track lighting is often used for accent lighting, with adjustable fittings that allow light to be focused precisely even on a small object.

When planning the layers of light in a room, it usually makes sense to consider the ambient lighting first, then consider task and accent lighting. “I like to move from general to specific when planning the lighting for a room,” says lighting designer Markus Earley of Providence, R.I. With rooms that are heavily task-oriented, however, such as home offices, some designers focus on task lighting first. And in a hallway that doubles as a photo or art gallery, accent lighting might be the first consideration.

“It’s so important to think about how you really use a space, and what you do in specific rooms,” says interior designer Bruce Fox, partner at Wells & Fox, which has offices in Chicago and Boston. “Only then you can start to identify where you need task lighting and accent lighting.”

How Electricity Works

https://science.howstuffworks.com/electricity3.htm

If you’ve ever moved paper clips around with a magnet or killed time arranging metal shavings into a beard on a “Wooly Willy” toy, then you’ve dabbled in the basic principles behind even the most complicated electric generators. The magnetic field responsible for lining up all those little bits of metal into a proper Mohawk haircut is due to the movement of electrons. Move a magnet toward a paper clip and you’ll force the electrons in the clip to move. Similarly, if you allow electrons to move through a metal wire, a magnetic field will form around the wire.

Thanks to Wooly Willy, we can see that there’s a definite link between the phenomena of electricity and magnetism. A generator is simply a device that moves a magnet near a wire to create a steady flow of electrons. The action that forces this movement varies greatly, ranging from hand cranks and steam engines to nuclear fission, but the principle remains the same.

One simple way to think about a generator is to imagine it acting like a pump pushing water through a pipe. Only instead of pushing water, a generator uses a magnet to push electrons along. This is a slight oversimplification, but it paints a helpful picture of the properties at work in a generator. A water pump moves a certain number of water molecules and applies a certain amount of pressure to them. In the same way, the magnet in a generator pushes a certain number of electrons along and applies a certain amount of “pressure” to the electrons.

In an electrical circuit, the number of electrons in motion is called the amperage or current, and it’s measured in amps. The “pressure” pushing the electrons along is called the voltage and is measured in volts. For instance, a generator spinning at 1,000 rotations per minute might produce 1 amp at 6 volts. The 1 amp is the number of electrons moving (1 amp physically means that 6.24 x 1018 electrons move through a wire every second), and the voltage is the amount of pressure behind those electrons.

Generators form the heart of a modern power station. In the next section, we’ll take a look at how one of these stations works.