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Why current leads the voltage in case of capacitor load?
Why voltage leads the current in case of inductive load?
Why both are with in phase in case of restive load?
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Answer Posted / keerthana
The reason that current leads voltage in a capacitor is
rooted in the way a capacitor works. Picture the capacitor.
It's basically two conductive plates separated by a short
distance and having a dielectric (insulator) between them.
Now, let's specify that our cap (capacitor) is completely
discharged and we'll hook it up to a DC voltage source
through a switch. Flip the switch on and current will begin
to flow, but it is important to look at what happens in just
the first instant of time. Electrons will begin to
accumulate on the negative plate and their presence there
will drive electrons off the positive plate. The capacitor
is building up a charge. It is developing a voltage across
(or between, if you prefer) the plates. But electrons have
to begin to pile onto the plate to actually create the
difference of potential (voltage) between the plates. The
moving electrons (and that's current) that are piling on the
plate are already beginning to flow before the voltage is
developed between the plates, so current is said to lead
voltage in a capacitor.
| Is This Answer Correct ? | 7 Yes | 3 No |
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