In an ac circuit, the current is given by $$i=5\sin(100t-\frac{\pi}{2})$$ and the ac potential is V = 200 sin(100t) volt. The power consumption is:

1. 20 W

2. 40 W

3. 1000 W

4. 0

Subtopic:  Power factor |
86%
From NCERT
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A $$100~\Omega$$ resistor is connected to a $$220~\text{V}$$, $$50~\text{Hz}$$ ac supply. The net power consumed over a full cycle is:

 1 $$484~\text{W}$$ 2 $$848~\text{W}$$ 3 $$400~\text{W}$$ 4 $$786~\text{W}$$
Subtopic:  Power factor |
87%
From NCERT
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A coil of inductive reactance of 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitive reactance 25 Ω. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is:

1. 0.56

2. 0.64

3. 0.80

4. 0.33

Subtopic:  Power factor |
84%
From NCERT
AIPMT - 2006
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The power factor of the given circuit is:

 1 $$1 \over 2$$ 2 $$1 \over \sqrt2$$ 3 $$\sqrt3 \over 2$$ 4 $$0$$



Subtopic:  Power factor |
82%
From NCERT
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The power factor of a series LCR circuit in resonance condition is:

$1.$ $Zero$ 
$2.$ $\frac{1}{2}$
$3.$ $\frac{1}{\sqrt{2}}$
$4.$ $1$

Subtopic:  Power factor |
81%
From NCERT
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The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. What is the power factor of this circuit?

1. 0.4

2. 0.5

3. 0.8

4. 1.0

Subtopic:  Power factor |
81%
From NCERT
NEET - 2016
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An inductor of inductance L and resistor of resistance R are joined in series and connected by a source of frequency ω. The power dissipated in the circuit is:

1. $\frac{\left({R}^{2}+{\omega }^{2}{L}^{2}\right)}{V}$

2. $\frac{{V}^{2}R}{\left({R}^{2}+{\omega }^{2}{L}^{2}\right)}$

3. $\frac{V}{\left({R}^{2}+{\omega }^{2}{L}^{2}\right)}$

4. $\frac{\sqrt{{R}^{2}+{\omega }^{2}{L}^{2}}}{{V}^{2}}$

Subtopic:  Power factor |
79%
From NCERT
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In a series LCR circuit, the current through the ac source is 2 A. If resistor R has a resistance of 10 Ω, the average power dissipated in the circuit is:

1. 20 W

2. 30 W

3. 10 W

4. 40 W

Subtopic:  Power factor |
78%
From NCERT
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What is the average power dissipated in the ac circuit if current i = 100sin100t A and V=100sin(100t+π/3) volts?

1. 2500 W

2. 250 W

3. 5000 W

4. 4000 W

Subtopic:  Power factor |
76%
From NCERT
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A circuit consists of 3 ohms of resistance and 4 ohms of reactance. The power factor of the circuit is:

1. 0.4

2. 0.6

3. 0.8

4. 1.0

Subtopic:  Power factor |
74%
From NCERT
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