Q. No.A resistor has a resistance of \(5.0 ~\Omega.\) There is a direct current of \(10~\text{A}\) in the resistor. What is the power dissipated by the resistor?
1. \(50~\text{W}\)
2. \(2500~\text{W}\)
3. \(20~\text{W}\)
4. \(500~\text{W}\)
1. \(50~\text{W}\)
2. \(2500~\text{W}\)
3. \(20~\text{W}\)
4. \(500~\text{W}\)
Subtopic: Heating Effects of Current |
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Level 1: 80%+
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A cell of internal resistance \(r\) drives current through an external resistance \(R.\) The power delivered by the cell to the external resistance will be maximum when:
1. \(R=1000 r\)
2. \(R=0.001r\)
3. \(R=2r\)
4. \(R=r\)
Subtopic: Heating Effects of Current |
84%
Level 1: 80%+
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Which of the following acts as a circuit protection device?
| 1. | Fuse | 2. | Conductor |
| 3. | Inductor | 4. | Switch |
Subtopic: Heating Effects of Current |
87%
Level 1: 80%+
NEET - 2019
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A resistor develops \(300~\text{J}\) of thermal energy in \(15~\text{s}\) when a current of \(2~\text{A}\) is passed through it. If the current increases to \(3~\text{A}\), the energy developed in \(10~\text{s}\) is:
1. \(150~\text{J}\)
2. \(250~\text{J}\)
3. \(350~\text{J}\)
4. \(450~\text{J}\)
1. \(150~\text{J}\)
2. \(250~\text{J}\)
3. \(350~\text{J}\)
4. \(450~\text{J}\)
Subtopic: Heating Effects of Current |
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Level 1: 80%+
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Two coils require \(20\) minutes and \(60\) minutes respectively to produce the same amount of heat energy when connected separately to the same source. If they are connected in parallel arrangement to the same source; the time required to produce the same amount of heat by the combination of coils will be:
1. \(10\) min
2. \(30\) min
3. \(15\) min
4. \(25\) min
1. \(10\) min
2. \(30\) min
3. \(15\) min
4. \(25\) min
Subtopic: Heating Effects of Current |
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Level 1: 80%+
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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 |
87%
Level 1: 80%+
AIPMT - 2012
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A house is served by \(220~\text{V}\) supply line. In a circuit protected by a fuse marked by \(9~\text{A},\) the maximum number of \(60~\text{W}\) lamps in parallel that can be turned on, is:
1. \(44\)
2. \(20\)
3. \(22\)
4. \(33\)
1. \(44\)
2. \(20\)
3. \(22\)
4. \(33\)
Subtopic: Heating Effects of Current |
84%
Level 1: 80%+
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Two electric bulbs, one of \(200~\text{V}-40~\text{W}\) and the other of \(200~\text{V}-100~\text{W}\) are connected in a domestic circuit. Then:
| 1. | they have equal currents through them. |
| 2. | the resistances of both the bulbs are the same. |
| 3. | the resistance of the bulb of \(40~\text{watts}\) is more. |
| 4. | the resistance of the bulb of \(100~\text{watts}\) is more. |
Subtopic: Heating Effects of Current |
85%
Level 1: 80%+
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A resistor with resistance \(R\) produces \(440~\text{J}\) of thermal energy in \(22~\text{s}\) when a current of \(2~\text{A}\) flows through it. When the current is increased to \(5~\text{A},\) the thermal energy generated in the same duration is:
1. \(1.80\) kJ
2. \(2.20\) kJ
3. \(2.75\) kJ
4. \(3.2\) kJ
1. \(1.80\) kJ
2. \(2.20\) kJ
3. \(2.75\) kJ
4. \(3.2\) kJ
Subtopic: Heating Effects of Current |
85%
Level 1: 80%+
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In India, electricity is supplied for domestic use at \(220~\text{V}.\) It is supplied at \(110~\text{V}\) in the USA. If the resistance of a \(60~\text{W}\) bulb for use in India is \(R\), the resistance of a \(60~\text{W}\) bulb for use in the USA will be:
| 1. | \(2R\) | 2. | \(\dfrac{R}{4}\) |
| 3. | \(\dfrac{R}{2}\) | 4. | \(R\) |
Subtopic: Heating Effects of Current |
82%
Level 1: 80%+
AIPMT - 2004
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