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Question 29: (a) What is meant by “electric power” ? Write the formula for electric power in terms of potential difference and current. (b) The diagram below shows a circuit containing a lamp L, a voltmeter and an ammeter. The voltmeter reading is 3 V and the ammeter reading is 0.5 A (i) What is the resistance of the lamp ? (ii) What is the power of the lamp ? (c) Define kilowatt-hour. How many joules are there in one kilowatt-hour ? (d) Calculate the cost of operating a heater of 500 W for 20 hours at the rate of ? ₹ 3.90 per unit. Lakhmir Singh Physics Class 10

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Explanation:power is how MUCH energy is transfered in a secondpotential DIFFERENC is also called as voltage sopower= current*voltage(b) Resistance=voltage/current=3/0.5=6 OHMS(II) power= I*V=3*.5=1.5W



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