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Basic Electricity-in HVAC Questions with Complete Answers
Alternating current (AC) 
current that reverses its direction of flow periodically. Reversals generally occur at regular intervals. 
 
Ampere 
The amount of current required to flow through a resistance of one ohm with a pressure of one volt, measured with an ammeter. 
Atom 
the smallest part of an element that contains all the properties of that element. 
Compound 
A substance that is a combination of atoms from at least two different elements. 
Conductor 
A wire that is used for the path of e...