A microwave oven operates on 1500 W of power and is used for 20 minutes. How much electrical energy, in joules and kW•h, is used by the microwave oven?

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Answer 1 · 2018-03-22T16:19:38

$1.8 MJ$ $"1.8 MJ"$ and $0.5 kWh$ $"0.5 kWh"$

$Power = \frac{Energy}{Time}$ $"Power" = "Energy"/"Time"$

Unit of power is Watt.

$"1 W" = 1\ "J/s"$

$"E" = 1500\ "J"/cancel"s" × 20 cancel"min" × (60 cancel"s")/cancel"min" = "1800000 J" = "1.8 MJ"$

or

$"E" = "1500 W" × 20 cancel"min" × "1 h"/(60 cancel"min") = "500 Wh" = "0.5 kWh"$