Alternating Current

Related Questions

• Current in the circuit is wattless, if

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• In a circuit, the value of the alternating current is measured by hot wire ammeter as 10 ampere. Its peak value will be

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• The potential difference V and the current i flowing through an instrument in an ac circuit of frequency f are given by $V = 5\cos \omega \,t$ volts and $I = 2\sin \omega t$ amperes (where $\omega = 2\pi f$). The power dissipated in the instrument is

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• If ${E_0}$ represents the peak value of the voltage in an ac circuit, the r.m.s. value of the voltage will be

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• A resistance of 20 ohms is connected to a source of an alternating potential $V = 220\sin (100\pi t)$. The time taken by the current to change from its peak value to r.m.s value is

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