When three identical bulbs are connected in series, the consumed power is \(10\) W. If they are now connected in parallel then the consumed power will be:

1. \(30\) W

2. \(90\) W

3. \(\frac{10}{3}\) W

4. \(270\) W

Subtopic: Â Heating Effects of Current |

Â 67%

From NCERT

AIPMT - 1998

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In a hot wire ammeter due to the flowing of the current, the temperature of the wire is increased by \(5^{\circ}\) C. If the value of the current is doubled, then the increase in temperature will be:

1. \(15^{\circ}\) C

2. \(20^{\circ}\) C

3. \(25^{\circ}\) C

4. \(30^{\circ}\) C

Subtopic: Â Heating Effects of Current |

Â 68%

From NCERT

AIPMT - 1998

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If the power dissipated in \(5~\Omega\) is \(20\) W then the power dissipated in \(4~\Omega\) is:

1. \(4\) W

2. \(6\) W

3. \(10\) W

4. \(20\) W

Subtopic: Â Heating Effects of Current |

Â 74%

From NCERT

AIPMT - 1999

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The value of \(R\) for which power in it is maximum is:

1. \(3~\Omega\)

2. \(6~\Omega\)

3. \(12~\Omega\)

4. \(9~\Omega\)

1. \(3~\Omega\)

2. \(6~\Omega\)

3. \(12~\Omega\)

4. \(9~\Omega\)

Subtopic: Â Heating Effects of Current |

Â 76%

From NCERT

AIPMT - 1999

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If there are two bulbs of (\(40~\text{W},200~\text{V}\)), and (\(100~\text{W},200~\text{V}\)), then the correct relation for their resistance is:

1. \(R_{40}<R_{100}\)

2. \(R_{40}>R_{100}\)

3. \(R_{40}=R_{100}\)

4. no relation can be predicted

Subtopic: Â Heating Effects of Current |

Â 87%

From NCERT

AIPMT - 2000

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Two \(220\)-volts, \(100\)-watts bulbs are connected first in series and then in parallel. Each time the combination is connected to a \(220\)-volts AC supply line. The power drawn by the combination in each case respectively will be:

1. \(50\) watts, \(100\) watts

2. \(100\) watts, \(50\) watts

3. \(200\) watts, \(150\) watts

4. \(50\) watts, \(200\) watts

Subtopic: Â Heating Effects of Current |

Â 76%

From NCERT

AIPMT - 2003

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An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle boils in \(10\) minutes. When the other coil is used the water boils in \(40\) minutes. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be:

1. \(8\) min

2. \(4\) min

3. \(25\) min

4. \(15\) min

Subtopic: Â Heating Effects of Current |

Â 78%

From NCERT

AIPMT - 2003

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A fuse wire is a wire of:

1. high resistance and high melting point

2. high resistance and low melting point

3. low resistance and low melting point

4. low resistance and high melting point

Subtopic: Â Heating Effects of Current |

Â 67%

AIPMT - 2003

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When three identical bulbs of \(60\) watts and \(200\)-volt rating are connected in series to a \(200\)-volt supply, the power drawn by them will be:

1. \(180\) watts

2. \(10\) watts

3. \(20\) watts

4. \(60\) watts

Subtopic: Â Heating Effects of Current |

Â 73%

From NCERT

AIPMT - 2004

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In India electricity is supplied for domestic use at \(220\) V. It is supplied at \(110\) V in the USA. If the resistance of a \(60\) W bulb for use in India is \(R\), the resistance of a \(60\) W bulb for use in the USA will be:

1. | \(2R\) | 2. | \(\dfrac{R}{4}\) |

3. | \(\dfrac{R}{2}\) | 4. | \(R\) |

Subtopic: Â Heating Effects of Current |

Â 81%

From NCERT

AIPMT - 2004

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