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प्रश्न
An electric heater is rated 220 V, 550 W. Calculate the electrical energy consumed in 3 hours?
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उत्तर
Energy consumed in 3 hrs = `(550 xx 3)/1000` = 1.65 kWh
= 1.65 × 3600 = 5940 kJ.
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The following table gives the electrical appliances used, their power and the average time for which they are used each day in a home. Estimate the monthly electricity bill if the rate is 60 paise per unit.
| Sr.no. | Name | Nos. | Power rating | Time/day |
| 1 | Bulb | 4 | 100 W | 7.5 hr |
| 2 | Fans | 2 | 50 W | 10 hr |
| 3 | T.V. | 1 | 100 W | 2 hr |
| 4 | Iron | 1 | 500 W | 1 hr |
| 5 | Electric stove | 1 | 750 W | 2 hr |
