What is the relationship between the AC current through a capacitor and the voltage across a capacitor?
Voltage and current are in phase
Voltage and current are 180 degrees out of phase
Voltage leads current by 90 degrees
Current leads voltage by 90 degrees✓Correct answer
Explanation
Current in a capacitor is proportional to the rate of change of voltage, so it peaks a quarter cycle before the voltage does. The result is that the current leads the voltage by 90 degrees, the opposite of the inductor case.