First slide

Electrical power

Question

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

Easy

A

1 unit
B

0.1 unit
C

5 unit
D

0.5 unit

Solution

The number of units of electricity consumed is
n = (total wattage× time in hour)/1000
Total wattage = 100 W Time in hour = 5 hours
Therefore, n = (100×5)/1000
= 0.5 units
So, the number of units of electricity consumed is 0.5 units.

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