Current Electricity questions
395 published questions with worked solutions.
- A resistor develops 300 J of thermal energy in 15 s, when a current of 2 A is passed through it. If the current increases to 3 A,...
- An aluminium wire is stretched to make its length, 0.4% larger. The percentage change in resistance is :
- A resistor dissipates 192 J of energy in 1 s when a current of 4A is passed through it. Now, when the current is doubled, the...
- Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in...
- When two identical batteries of internal resistance 1 , each are connected in series across a resistor R, the rate of heat...
- Heater of an electric kettle is made of a wire of length L and diameter d. It takes 4 minutes to raise the temperature of 0.5 kg...
- An incandescent bulb has a thin filament of tungsten that is heated to high temperature by passing an electric current. The hot...
- Which of the following items is used in the household wirings to prevent accidental fire in case of short circuit ?
- When three resistors, each having resistance r, are connected in parallel, their resultant resistance is x. If these three...
- The property of electric current which is applicable in the fuse wire is
- A circular coil of single turn has a resistance of 20 Ω. Which one of the following is the correct value for the resistance...
- The connecting cable of electrical appliances like electric iron, water heater or room heater contains three insulated copper...
- Let us consider a copper wire having radius r and length l. Let its resistance be R. If the radius of another copper wire is 2r...
- Two metallic wires A and B are made using copper. The radius of wire A is r while its length is l. A dc voltage V is applied...
- Which one of the following statements regarding Ohm's law is not correct ?
- "The sum of emfs and potential differences around a closed loop equals zero" is a consequence of
- Water is heated with a coil of resistance R connected to domestic supply. The rise of temperature of water will depend on 1....
- The cost of energy to operate an industrial refrigerator that consumes 5 kW power working 10 hours per day for 30 days will be...
- A metallic wire having resistance of 20 Ω is cut into two equal parts in length. These parts are then connected in parallel. The...
- A current of 1·0 A is drawn by a filament of an electric bulb for 10 minutes. The amount of electric charge that flows through...
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