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For the square wave shown in given figure,
For the idealized full wave rectifier system the average and rms value of the voltage is
The instantaneous power delivered to the 5 Ω resistor at t = 0 in the given circuit is
At t = 0, the given circuit is as shown below.
∴
For a sinusoidal waveform, the ratio of average to rms value is
For a sinusoidal waveform,
An impedance of (3 + j 4) Ω is connected in parallel with a resistance of 10 Ω. The ratio of power loss in these parallel circuits is
A 0.2 HP induction motor runs at an efficiency of 85%. If the operating power factor is 0.8 lag, the reactive power taken by the motor is
∴ Reactive power taken by motor is
In an a.c. circuit, v = 100 sin (ωt + 30°) V, i = 5 sin(ωt 30°) A. The apparant and reactive power in the circuit are respectively
The inductive reactance in series with Z in the circuit shown below has a value of 25 Ω If the voltage drop a cross Z is 179 volts, the power dissipated in the circuit is 320 W.
The reactive part of Z is
Now, power dissipated,
The values of current I_{1} and I_{2} in the circuit shown below are given by:
1A = (0.8 + j0.2) A and I_{2} = (1  j0.5) A
The total power lost in the 5 Ω resistor is
Power lost in the 5Ω resistor is
(As current through 5 Ω resistor = I_{1} I_{2})
Given, ω = 1 rad/sec. So, the circuit can be redrawn as shown below.
Total impedance of the circuit is
∴ p.f. of the given circuit = cos90° = 0
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