Q.

Calculate the number of units of electricity used if a bulb of 100 W is kept on for 5 hours.

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a

1 unit

b

0.1 unit

c

5 unit

d

0.5 unit

answer is D.

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Detailed Solution

The number of units of electricity consumed isn = (total wattage× time in hour)/1000Total wattage = 100 W      Time in hour = 5 hoursTherefore, n = (100×5)/1000= 0.5 unitsSo, the number of units of electricity consumed is 0.5 units.
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Calculate the number of units of electricity used if a bulb of 100 W is kept on for 5 hours.