Electricity
ICSE · Class 8 · Physics
Practice quiz for Electricity — ICSE Class 8 Physics. MCQs and questions with answers to test your preparation.
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Quick Quiz: Electricity
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A heater of power 1.5 kW works for 2 hours 30 minutes each day. What electrical energy does it consume in one day?
An electric iron rated 1.5 kW is used for 30 minutes. What energy is consumed in joules?
A bulb of 100 W, an iron of 750 W, and a television of 100 W are used together for 3 hours a day. What total electrical energy is consumed in a day?
An appliance of power 1.5 kW is used for 4 hours every day. What is the cost of electricity for 60 days at ₹6.25 per kWh?
Sample Questions
A heater works at 220 V and draws 6.8 A. What is its power?
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1496 W
Use P = VI. So, P = 220 × 6.8 = 1496 W. This is about 1.5 kW.
A 100 W bulb works at 220 V. What is the safe current through it?
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0.45 A
Use I = Power / Voltage. So, I = 100 / 220 = 0.4545... A, which is about 0.45 A.
An electric oven of power 3 kW works for 2 hours per day. What electrical energy is consumed in 30 days?
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180 kWh
Daily energy = 3 × 2 = 6 kWh. In 30 days, energy = 6 × 30 = 180 kWh.
A 12 V battery sends a current of 2 A through a wire for 30 minutes. What electrical energy is supplied?
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43,200 J
Convert 30 minutes to 1800 s. Use W = VIt. So, W = 12 × 2 × 1800 = 43,200 J.
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