Electrical Power and Household Circuits — Practice Quiz
ICSE · Class 10 · Physics
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What is the commercial unit of electrical energy?
Why is it necessary to connect the fuse in the live wire only?
In a three-pin plug, which pin is the thickest and longest?
What is the standard household voltage supply in India?
Sample Questions
Which of the following formulas correctly represent electrical power?
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P = V × I, P = I² × R, P = V²/R
All three formulas P = V × I, P = I² × R, and P = V²/R are correct expressions for electrical power. They can be derived from each other using Ohm's law (V = IR).
Calculate the electrical energy consumed by a 100W bulb used for 5 hours.
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0.5 kWh
Energy = Power × Time = 100W × 5h = 500 Wh = 0.5 kWh. Remember to convert watts to kilowatts by dividing by 1000.
Why are household appliances connected in parallel?
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Each appliance gets full 220V, Each appliance works independently, If one appliance fails, others continue working
Parallel connection ensures each appliance gets full voltage (220V), works independently, and failure of one doesn't affect others. This is essential for household circuits.
What is the purpose of earthing in electrical appliances?
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To protect from electric shock
Earthing provides a low resistance path for current to flow to ground if live wire touches the metal body of appliance, preventing electric shock to users and blowing the fuse.
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