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Chapter 21
Residential Electrical
| Term | Definition |
|---|---|
| Ampere (amp) | The unit of current used to measure the amount of electricity flowing through a conductor per unit time. |
| Circuit | A path through which electricity flows from a source to one or more devices and then returns to the source. |
| Circuit Breaker | A safety device designed to open and close a circuit by non-automatic means, and to open the circuit automatically on a predetermined overload of current. |
| Conductor | A material, such as copper, that permits the flow of electricity; usually refers to a wire. |
| Convenience Outlet | A contact device attached to a circuit to allow electricity to be drawn off for appliances or lighting. |
| Fuse | A safety device that breaks (opens) the circuit when it is overloaded by melting a fusible link. |
| Lighting Outlet | An outlet intended for a lighting fixture. |
| Ohm | The unit of measure of electrical resistance in a circuit. |
| Receptacle | A contact attached to a circuit to allow electricity to be drawn off for appliances or lighting; the same as a convenience outlet. |
| Service Drop | The overhead service conductors between the last utility pole and the first point of attachment to the house; may be overhead or underground. |
| Service Entrance | The fittings and conductors that bring electricity into the building. |
| Service Panel | The main distribution box that receives the electricity and distributes it to various points in the house through branch circuits. |
| Voltage | Pressure that forces current through a wire. One volt is the force that causes one ampere of current to flow through a wire that has one ohm of resistance. |
| Watt | A unit of measure of work in a circuit; one watt is equal to one ampere under one volt of pressure (amp x volts = watts). |
| Branch Circuit | Is one of several individual circuits from the distribution panel that is routed to similar devices. |
| Lighting Circuits | These are primarily for lighting. They serve permanently installed lighting fixtures as well as receptacle outlets into which lamps, radios, TVs, clocks and other 120V devices, other than kitchen appliances, are plugged. |
| Special Appliance Circuits | Are located in the kitchen, usually above the countertop. They are designed for electric fry pans, blenders, toasters, mixers, and similar appliances that require large amounts of current. |
| Individual Appliance Circuits | These are circuits that serve single, permanently installed appliances such as a range, water heater, washer, dryer, water pump, and table saw. |
| Single-Pole Switch | Simply opens and closes the circuit. |
| Three-Way Switch | Allows a fixture to be turned on and off from two locations. Common locations are entrances, garages, stairs, and rooms that have more than one entrance. |
| Dimmer Switch | Is a special switch that allows the light to be adjusted to the desired brightness. |
| Ground-Fault Circuit Interrupter (GFCI) | Is a safety device that continuously monitors the amount of current going to the load and compares it to that coming back. If the amount returning is less than it should be, it will trip (open) the circuit to prevent electricity from going somewhere else. |
| Distribution Panel | Also called a service panel, it receives electricity from the meter and distributes it via branch circuits. |
Created by:
ALookenbill