Alternating Current

Related Questions

• 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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• A coil has $L = 0.04 H$ and $R = 12\,\Omega $. When it is connected to $220V$, $50H$z supply the current flowing through the coil, in amperes is

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• In a LCR circuit capacitance is changed from $C$ to $2C$. For the resonant frequency to remain unchanged, the inductance should be change from $L$ to

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• The phase angle between e.m.f. and current in LCR series ac circuit is

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• In a series LCR circuit, resistance $R = 10\Omega $ and the impedance $Z = 20\Omega .$ The phase difference between the current and the voltage is

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