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Dimmer Switches

are used to control lighting level and can save energy.

3-Way Switches

3-way switches are used to control lights with two switches.

Toggling 3-way Switch Wiring Diagram

Electrical Outlets

A receptacle (electrical outlet) is a device that supplies power to an electrical load through a cord and plug.

Split Receptacles

A duplex receptacle has removable metal tabs that electrically connect line and neutral together on each receptacle. A split receptacle is a duplex with one or both tabs removed to isolate each receptacle from the other.

Split Receptacle, Same Circuit

4-Way Switches

4-way switch configurations are used to control lights with three or more switches.

Toggling 4-way Switch Wiring Diagram

Ceiling Fan Switch Wiring

3-wire cable travels from the switch box and connects to the fan, lights, neutral, and ground wires.

Ohms Law PEIR Symbol Thumb

Wire Connectors

are used to connect two or more wires together. There are many types of wire connectors, the most common are twist-on.

Electrical Troubleshooting

There are certain things that you can do in a home or office to troubleshoot and fix certain electrical problems.

Digital Multimeter Wire Connectors

Basic electricity

includes electrical definitions, ohm's law, and electrical circuit information including direct and alternating current.

Fluorescent Ballasts

Fluorescent lamps use a ballast which transforms line voltage to a type of power to start up and operate the lamp(s).

Fluorescent Ballast

Replace Ballasts

How to replace a fluorescent ballast, including 2, 3, and 4 lamp series and parallel ballasts. Includes a how to replace a ballast video.

1 Lamp Series to 2 Lamp Parallel Lampholder Wiring Diagram


are used to control power to a load. They can be found on anything that runs on electricity.

Light Switch Wiring

With conventional light switch wiring using NM cable, the NM supplies line voltage from the electrical panel to a light switch outlet box.

Light Switch Wiring using NM Cable

Electrical 101 Homepage

Question or Comment?

Fluorescent Lampholders

A fluorescent tube should always be replaced with the same diameter bulb. The lampholders are made of plastic, so be careful not to break them when replacing these bulbs.

Tombstone non-shunted bypin

Troubleshoot Outlets

A plug should always fit tightly into a receptacle. If a plug is loose or falls out of a receptacle, the receptacle needs to be replaced.

Receptacle Tester

Electrical Voltages

110, 115, 120, 125, 130, 220, 230, 240, 250 volts, what are all these different voltages?

240 volt diagram 1

Ground Fault Circuit Interrupters (GFCIs)

A GFCI is a receptacle or circuit breaker that is used to increase safety in areas that are prone to the risk of electric shock.

Replace Fluorescent Tubes with LED

There are is lot to consider when choosing LED replacement tubes for fluorescent fixtures. Here is what you need to know before choosing the right LED tubes.

LED Label Cree

 How to Direct-Wire Dual-Ended LED Tube Lights 2 Lamps

For dual-ended direct-wired LEDs, line is connected to the lampholders at one end of the fixture, neutral at the other end.

2 Lamp Led Dual-Ended Parallel Ballast Lampholder Wiring Diagram

Circuit Breakers

Circuit breakers protect a circuit from overloads and short circuits. When the current exceeds the rating of the breaker, it will trip. Circuit breaker ratings for household use are typically 15, 20, and 30 amps.

Tripped Circuit Breaker

Troubleshoot Switches

Switches are used to turn lightsVoltage Detector on Switch or electrical devices on and off. Usually when a switch fails, a light or electrical device will not turn on. After determining that a light bulb is not burned out and a circuit breaker or GFCI is not tripped, the switch may have failed.

Ceiling fan switch wire makeup Light switch and dimmer 15 amp receptacle Toggling Single Pole Light Switch GFCI Receptacle