Capacitors
A when the voltage across its plates is  of the voltage from ground to one of its platesB when the current through the capacitor is the same as when the capacitor is discharged
C when the voltage across the plates is 0.707 of the input voltage
D when the current through the capacitor is directly proportional to the area of the plates
ANS:B - when the current through the capacitor is the same as when the capacitor is discharged Option B is correct because a capacitor will be fully charged if the current that it discharges has the same value as the current from the source that charged it. For example a voltage source has a value of 25V with current equals to 1 Ampere. If the source is turned off, the capacitor will discharge, if the current that the capacitor discharges has a value of 1 Ampere then we can assume that is has been fully charged since a current of 1 ampere would indicate that the value of charge stored in the capacitor is 25V. Share : |
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