Alternating Cur...

The power factor of a good choke coil is

An alternating current source of frequency 100 Hz is joined to a combination of a resistance, a capacitance and a coil in series. The potential difference across the coil, the resistance and the capacitor is 46, 8 and 40 volt respectively. The electromotive force of alternating current source in volt is

A 10 ohm resistance, 5 mH coil and 10 μF capacitor are joined in series. When a suitable frequency alternating current source is joined to this combination, the circuit resonates. If the resistance is halved, the resonance frequency

In a series circuit R = 300 Ω, L = 0.9 H, C = 2.0µF and ω = 1000 rad/sec. The impedance of the circuit is

In a series LCR circuit, operated with an ac of angularfrequency ω, the total impedance is

An e.m.f. E = 4 cos (1000 t) volt is applied to an LR–circuit of inductance 3 mH and resistance 4 ohms. The amplitude of current in the circuit is

In an ac circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°, the value of inductive reactance will be

A coil of inductance L has an inductive reactance of X_Lin an ac circuit in which the effective current is I. The coil is made from a super–conducting material and has no resistance. The rate at which power is dissipated inthe coil is