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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• The impedance of a circuit consists of $3 ohm$ resistance and $4 ohm$ reactance. The power factor of the circuit is

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• If resistance of $100 \Omega$ , inductance of $0.5$ henry and capacitance of $10 \times {10^{ - 6}}F$ are connected in series through 50 Hz ac supply, then impedance is

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• The quality factor of LCR circuit having resistance ($R$) and inductance ($L$) at resonance frequency ($\omega $) is given by

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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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