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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