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Electricity

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27 Feb 2012 01:24:52 IST

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ac through inductor

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acrdng 2 d graph given in ncert physics(attached)...d current produced lags behind alternating emf...physically wot does it mean...when the applied initial voltage is zero,how can max current flow in the opposite direction??....also in some other articles(in web),emf is said to vary with respect to current....actually wot is happening

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edison

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27 Feb 2012 10:44:58 IST

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The phase lag between current and voltage in purely inductive circuit is pi/2. Unlike in purely resistive circuit where the change in voltage (ac) is synchronized with change in current (ac) and the two are in phase that is phase difference is ZERO. But in inductive circuit current (ac) is not able to chase the voltage and this results in a phase lag, certainly current can be non zero when voltage is zero as here there is a phase difference and the applied voltage is ac. Hope it is clear !!!

Palanichamy.M

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3 Mar 2012 14:48:09 IST

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Charges can be moved by the application of emf or potential difference. This is the case we all expect that a current can be there only when there is a pot.diff. But in the case of AC, THE PHYSICAL MEANING IS that when the emf or p.d drops to zero momentarily or quick the charges DUE TO INERTIA CONTINUES TO MOVE which constitute current even without pot.diff

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