capacitor --A device used to store a charge of electricity.
circuit breaker--A safety switch installed in a circuit that automatically interrupts the flow of electricity if the current exceeds a predetermined amount. Once tripped, a circuit breaker can be reset manually.
compressor --A machine that compresses, or reduces the volume of, air or gas.
condenser --A device used to convert gases or vapors to a liquid.
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continuity--The state of having a continuous electrical path.
evaporator--A device used to change a liquid into vapor.
idler pulley--A pulley used to take the slack out of a drive belt.
Insulator--A nonconducting material.
Ohm--The unit for measuring electrical resistance.
relay--A switch operated by an electromagnet.
resistance--That which opposes the flow of an electrical current; measured in units called ohms.
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service entrance panel--The main power cabinet containing the main breaker and circuit breakers distributing electricity throughout the residence.
solenoid --A coil of wire that uses an electrical current to create a magnetic field.
terminal --A point used to make electrical connections.
thermostat-- A device used to control temperatures to a predetermined level.
volt-ohmmeter-- A meter used for measuring voltage and electrical resistance.
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