Two cities are \(150~\text{km}\) apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is \(8\) volts and the average resistance per km is \(0.5~\text{ohm}\). The power loss in the wire is:

1. \(19.2~\text{W}\)

2. \(19.2~\text{kW}\)

3. \(19.2~\text{J}\)

4. \(12.2~\text{kW}\)

Subtopic: Heating Effects of Current |

82%

From NCERT

AIPMT - 2014

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If the voltage across a bulb rated \((220~\text{V}\text-100~\text{W})\) drops by \(2.5\%\) of its rated value, the percentage of the rated value by which the power would decrease is:

1. \(20\%\)

2. \(2.5\%\)

3. \(5\%\)

4. \(10\%\)

Subtopic: Heating Effects of Current |

77%

From NCERT

AIPMT - 2012

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The power dissipated in the circuit shown in the figure is \(30~\text{Watts}\). The value of \(R\) is:

1. \(15~\Omega\)

2. \(10~\Omega\)

3. \(30~\Omega\)

4. \(20~\Omega\)

Subtopic: Heating Effects of Current |

84%

From NCERT

AIPMT - 2012

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If power dissipated in the \(9~\Omega\) resistor in the circuit shown is \(36\) W, the potential difference across the \(2~\Omega\) resistor will be:

1. \(8\) V

2. \(10\) V

3. \(2\) V

4. \(4\) V

Subtopic: Heating Effects of Current |

78%

From NCERT

AIPMT - 2011

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The rate of increase of thermo-emf with the temperature at the neutral temperature of a thermocouple:

1. | is zero. |

2. | depends upon the choice of the two materials of the thermocouple. |

3. | is negative. |

4. | is positive. |

Subtopic: Heating Effects of Current |

AIPMT - 2011

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A thermocouple of negligible resistance produces an e.m.f. of 40 µV/ºC in the linear range of temperature. A galvanometer of resistance 10 ohm whose sensitivity is 1 µA/division, is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be:

1. 0.25ºC

2. 0.5 ºC

3. 1ºC

4. 0.1ºC

Subtopic: Heating Effects of Current |

53%

From NCERT

AIPMT - 2011

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The thermo e.m.f E in volts of a certain thermocouple is found to vary with temperature difference θ in ºC between the two junctions according to the relation

$E=30$ $\theta -\frac{{\theta}^{2}}{15}$ The neutral temperature for the thermo-couple will be:

1. 400ºC

2. 225ºC

3. 30ºC

4. 450ºC

Subtopic: Heating Effects of Current |

61%

AIPMT - 2010

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A current of \(3~\text{A}\) flows through the \(2~\Omega\) resistor shown in the circuit. The power dissipated in the \(5~\Omega\) resistor is:

1. | \(4~\text{W}\) | 2. | \(2~\text{W}\) |

3. | \(1~\text{W}\) | 4. | \(5~\text{W}\) |

Subtopic: Heating Effects of Current |

80%

From NCERT

AIPMT - 2008

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An electric kettle takes \(4~\text{A}\) current at \(220~\text{V}\). How much time will it take to boil \(1\) kg of water at a temperature of \(20^{\circ}\text{C}\)? The temperature of boiling water is \(100^{\circ}\text{C}\).

1. | \(6.3\) min | 2. | \(8.4\) min |

3. | \(12.6\) min | 4. | \(4.2\) min |

Subtopic: Heating Effects of Current |

51%

From NCERT

AIPMT - 2008

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The total power dissipated in watts in the circuit shown below is:

1. | \(16\) W | 2. | \(40\) W |

3. | \(54\) W | 4. | \(4\) W |

Subtopic: Heating Effects of Current |

87%

From NCERT

AIPMT - 2007

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