# what is the theoretical explanaton for the current lead in capacitor?

Home Electrical Engineering Forum General Discussion what is the theoretical explanaton for the current lead in capacitor?

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• #10611
Keymaster

we all know that current in a pure capacitor leads the voltage applied to it by 90 degrees.can u find out the theoretical basis behind it?

#12455
jaymez83
Participant

When you first turn on the power in a capacitive circuit, the capacitor acts like a short circuit. Current rushes in at maximum rate, then gradually decreases as the capacitor charges.

While this is happening, the voltage across the capacitor slowly rises, from zero to max. At full charge, the capacitor acts like an open circuit. Current is zero and voltage is at its maximum.

So I can be said that voltage lags the current by 90′

#12457
Vidhyut S.
Participant

Absolutely right….

#12458
Keymaster

Vidhyut S. said:

Absolutely right….

thats ok but iamasking the theoretical basis i.e basedon the polarisation process.

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