The instantaneous values of alternating
current and voltages in a circuit are given
as
The average power in Watts consumed in the
circuit is
(a)
(b)
(c)
(d)
In an AC circuit an alternating voltage volt is connected to a capacitor The value of the current in the circuit is
(a) 100 mA
(b) 200 mA
(c) 20 mA
(d) 10 mA
The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be
(a) (b)
(c) (d)
An \(AC\) voltage is applied to a resistance \(R\) and an inductor \(L\) in series. If \(R\) and the inductive reactance are both equal to \(3~ \Omega, \) then the phase difference between the applied voltage and the current in the circuit will be:
1. | \( \pi / 4\) | 2. | \( \pi / 2\) |
3. | zero | 4. | \( \pi / 6\) |
The rms value of potential difference V shown in the figure is
(1)
(2)
(3)
(4)
A coil has resistance and inductive reactance at 50 Hz frequency. If an AC source of 200 V, 100 Hz, is connected across the coil, the current in the coil will be:
1.
2.
3.
4.
In the given circuit the reading of voltmeter are 300V each. The reading to the voltmeter and ammeter A are respectively :
(a) 150V, 2.2A
(b) 220V, 2.2A
(c) 220V, 2.0A
(d) 100V, 2.0A
A 220V input is supplied to a transformer.The output circuit draws a current of 2.0A at 440V. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is
1. 3.6A 2. 2.8A
3. 2.5A 4. 5.0A
A condenser of capacity C is charged to a potential difference of The plates of the condenser are then connected to an ideal inductor of inductance L. The current through the inductor when the potential difference across the condenser reduces to is
1.
2.
3.
4.
Power dissipated in an L-C-R series circuit connected to an AC source of emf is
(a)
(b)
(c)
(d)