Electricity
ICSE · Class 8 · Physics
Most important questions from Electricity for ICSE Class 8 Physics board exam 2026. MCQs, short answer, and long answer questions with marks.
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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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