Power dissipated in an LCR series circuit connected to an a.c source of emf ? is
Power dissipated in an LCR series circuit connected to an a.c source of emf ? is
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(a) ?ￂﾲ √ [ R² + ( L? – 1 / C?)² ] / R (b) […]
Alternating Current
An alternating emf given by equation e=300 sin[(100 π)t] V
An alternating emf given by equation e=300 sin[(100 π)t] V is applied to a resistance 100Ω. The rms current through the circuit is (in amperes)
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(a) 3/√2 (b) 9/√2 (c) 3 (d) […]
In an a.c circuit the e.m.f. (e) and the current (i) at any instant are given
In an a.c circuit the e.m.f. (e) and the current (i) at any instant are given respectively by e = E₀ sin ?t i = I₀ sin (?t – ?) The average power in the […]
What is the value of incidence L for which the current is maximum in a series LCR
What is the value of incidence L for which the current is maximum in a series LCR circuit with C = 10 µF and ? = 1000 s⁻¹?
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(a) 1 mH (b) […]
The average power dissipated in AC circuit is 2 W. If a current flowing through
The average power dissipated in AC circuit is 2 W. If a current flowing through a circuit is 2 A, impedance is 1Ω, then what is the power factor of the circuit?
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A transformer is used to light a 100 W and 110 V lamp from a 220 V mains.
A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately
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In L-C-R series circuit, an alternating emf e and current i are given by the equations
In L-C-R series circuit, an alternating emf e and current i are given by the equations e=100 sin (100t) V. i=100 sin(100t+π/3)mA . The average power dissipated in the circuit will be
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The primary and secondary coil of the transformer have 50 and 1500 turns respectively
The primary and secondary coil of the transformer have 50 and 1500 turns respectively. If the magnetic flux ? linked with the primary coil is given by ? = ?￢ﾂﾀ + 4t, where ? is […]
A step-down transformer has 50 turns on secondary and 1000 turns on primary winding.
A step-down transformer has 50 turns on secondary and 1000 turns on primary winding. If a transformer is connected to 220 V, 1 A AC source, then what is output current of the transformer?
A step-up transformer operates on a 230 V line and supplies a current of 2 A.
A step-up transformer operates on a 230 V line and supplies a current of 2 A. The ratio of primary and secondary winding is 1:25. The primary current is
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(a) 12.5 A […]