Originally posted by Erin G.@Mar 14 2005, 11:26 AM
Electrimotive force, or voltage, is the electrical "pressure" that make electrons move. Current (amps) is a measurement of the volume of electrons actually in motion. The electrons were set in motion because a voltage was applied to the circuit.
This is the relationship between an AC voltage & current in a circuit. In a resistive circuit (eg heater, toaster, etc.) the current is in phase with the voltage. However, some devices with magnetic (inductive) components in the circuit (eg ballasts, motors, etc.) alter the phase relationship, which causes extra current to be drawn for the same power output. Ballasts (being inductive components) cause the current to lag behind the voltage.
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