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When is a capacitor fully charged?

. when the voltage across its plates is
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of the voltage from ground to one of its plates
. when the current through the capacitor is the same as when the capacitor is discharged
. when the voltage across the plates is 0.707 of the input voltage
. when the current through the capacitor is directly proportional to the area of the plates

Syed Asif Rehman said: (Jan 29, 2011)
Capacitor charges equal to the voltage applied. Then it is disconnected but the charge remains the same even if it is disconnected. So when it is discharged using resistor, the flow of current is same as it is charged to the extent of battery.

Nilesh said: (Jan 7, 2012)
But capacitor charging depend upon directly proportional to the area off plate.

Rahulur said: (Oct 14, 2013)
When capacitor is fully charged, it act as an Open circuit because.I = 0 between 2 equal voltage sources.After 5T, capacitor discharges and I becomes 0.

Mahinder said: (Nov 12, 2013)
When capacitor is discharged then the capacitor is ready for used and then its work start.

Faizan said: (May 16, 2014)
Correct answer for this question should be that, a capacitor fully charged when the current through it is zero.

Ashishpal said: (May 19, 2014)
Capacitor is fully charged means that the voltage of capacitor is equal to the voltage of the battery.

Christine Ashimwe said: (Jun 27, 2014)
The capacitor is fully charged., If the voltage is constant, there"s no current. If the voltage on both sides of the resistor is the same, there"s no current through the resistor and hence into the capacitor, so that"s the steady-state - what you call "full" - the capacitor charged to the supply voltage.

Rajnish Ranjan said: (Jul 25, 2014)
Capacitor is fully charged when current through it is zero.

Neeraj said: (Feb 20, 2019)
How can be measured current in a discharged condition? please let me know.

Anomie said: (May 2, 2019)
The capacitor is charge up to 63% of its time T=RC so maximum voltage should be 0.703 of its applied voltage and it is fully charged maximum upto 63% of its applied input voltage.Ans is C.

Anomie said: (Jan 28, 2021)
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.

Jignesh Prajapati said: (Oct 14, 2021)
When capacitor is fully discharged - maximum charging current flows.When capacitor is fully charged - charging current is zero.

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