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. | \(0\) |

$\mathrm{}$

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

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

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

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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