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प्रश्न
Calculate the number of units of electricity used if a bulb of 18 W is kept on for 9 hours.
संख्यात्मक
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उत्तर
Given Data:
Power of the bulb (P) = 18 W = `18/1000` kW = 0.018 kW
Time duration (t) = 9 hours
Formula:
The commercial unit of electricity consumed is measured in Kilowatt-hours (kWh), where 1 kWh = 1 unit.
Electrical Energy (E) = Power (P in kW) × Time (t in hours)
= 0.018 kW × 9 hours
= 0.162 kWh
Since 1 kWh = 1 electrical unit
Number of units = 0.162 units
The total number of units of electricity used by the bulb is 0.162 units.
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