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1. Electricity
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Q15 of 330 Page 58

An electric bulb is connected to a 220 V power supply line. If the bulb draws a current of 0.5 A, calculate the power of the bulb.

Here, Potential difference (V) = 220V, Current (I) = 0.5amp, Power = ?

We know that


P = VI = 220 X 0.5


P = 110 watt


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13

Define watt-hour. How many joules are equal to 1 watt-hour?

14

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16

In which of the following cases ore electrical energy is consumed per hour?

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(ii) A current of 2 amperes passed through a resistance of 100 ohms.

17

An electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find the energy consumed and the current drawn.

Questions · 330
1. Electricity
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