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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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: Â Heating Effects of Current |
Â 87%
From NCERT
AIPMT - 2007
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A $$5\text-$$ampere fuse wire can withstand a maximum power of $$1$$ watt in a circuit. The resistance of the fuse wire is:

 1 $$5~\Omega$$ 2 $$0.04~\Omega$$ 3 $$0.2~\Omega$$ 4 $$0.4~\Omega$$
Subtopic: Â Heating Effects of Current |
Â 86%
From NCERT
AIPMT - 2005
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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: Â Heating Effects of Current |
Â 82%
From NCERT
AIPMT - 2014
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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: Â Heating Effects of Current |
Â 80%
From NCERT
AIPMT - 2008
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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: Â Heating Effects of Current |
Â 78%
From NCERT
AIPMT - 2011
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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: Â Heating Effects of Current |
Â 77%
From NCERT
AIPMT - 2012
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Power consumed in the given circuit is $$P_1$$. On interchanging the position of $$3~\Omega$$ and $$12~\Omega$$ resistances, the new power consumption is $$P_2$$. The ratio of $$\frac{P_2}{P_1}$$ is:

 1 $$2$$ 2 $$1 \over 2$$ 3 $$3 \over 5$$ 4 $$2 \over 5$$
Subtopic: Â Heating Effects of Current |
Â 69%
From NCERT
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The power dissipated across the $$8~\Omega$$ resistor in the circuit shown here is $$2~\text{W}$$. The power dissipated in watts across the $$3~\Omega$$ resistor is:

 1 $$2.0$$ 2 $$1.0$$ 3 $$0.5$$ 4 $$3.0$$
Subtopic: Â Heating Effects of Current |
Â 69%
From NCERT
AIPMT - 2006
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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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