ICSE 2009 Solved Important Papers of Physics By Mr. M.P.Keshari
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Electric Power and Household Electricity [Numericals] (Solved)
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Numerical – 1. An electric heater is rated 500 kVA, 220 V. If the heater is operated for 1 hour, calculate the energy consumed
(i) in kWh and
(ii) in joule.
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Numerical – 2. Convert 1 kWh into joule.
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Numerical – 3. An electric bulb is marked 220V – 100 W. The bulb is connected to a 220 V supply.
(i) Calculate (a) the resistance of the filament. (b) Current flowing through the filament.
(ii) is the filament resistance of the glowing bulb greater, smaller or same as compared to its resistance when it is not glowing?
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Numerical – 4. A refrigerator is marked 80 W, 220 V. (i) How much energy does it consume in one day if on an average it is used for 20 hours a day? (ii) What is likely to happen if the voltage drops to 50 V.
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Numerical – 5. What quantity of heat will be produced in a coil of resistance 80 ohm if current of 3 A is passed through it for 4 second.
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Numerical – 6. Calculate the electrical energy in SI units consumed by a 100 W bulb and a 60 W fan connected in parallel in 5 minutes.
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Numerical – 7. A family uses a light bulb of 100 W, a fan of 100 W and an electric heater of 1000 W each for 8 hours daily. If the cost of electricity is Rs2.00 per unit, what is the expenditure for the family per day on electricity?
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Numerical – 8. A bulb is marked 100 W, 220 V and an electric heater is marked 2000 W, 220 V
(i) What is the ratio of their resistances?
(ii) In which of the above a thicker connecting wire or lead is required?
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Numerical – 9. A geyser has a label 2 kW, 240 V. What is the cost of running it for 30 minute, if the cost of electricity is Rs3.00 per unit?
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Numerical – 10. An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at 60 paisa per unit.
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Paper By Mr. M. P. Keshari [ For Further Enquiry 09434150289]
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