Transient analysis and behaviour of inductor and capacitor

Discussion in 'General Electronics Chat' started by skkk, May 12, 2010.

1. skkk Thread Starter New Member

Apr 5, 2010
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Any body explain me how inductor and capacitor behave in transient analysis when t=0,t>0. And why? Means how capacitor and inductor open circuit and short short circuit and when?

Last edited: May 12, 2010
2. studiot AAC Fanatic!

Nov 9, 2007
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What does all that shorthand mean?

Feb 17, 2009
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4. bk8190 New Member

May 12, 2010
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Capacitors are open circuits to DC, and short circuits to high frequencies.
Inductors are open circuits to high frequencies, and short circuits to DC.

The voltage across a capacitor cannot change instantly, and the current through an inductor cannot change instantly.

A capacitor is governed by the differential equation
I = C (dV/dt)

An inductor is governed by the differential equation
V = L (dI/dt)

5. Ghar Active Member

Mar 8, 2010
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In this case DC means "after a long time".
Suddenly connecting a DC source (like a battery) is not true mathematical DC. After a "long time" it's DC, when it's entirely constant. That's when the capacitors are fully charged (open circuit, no more current) and the inductors carry the maximum current they can (short circuit, no more voltage).