How much electrical energy is used by a 1000-watt microwave that runs for 30 minutes?

Feb 9, 2018

$1 , 800 , 000 J \left(1.8 M J\right)$

Explanation:

$E = P \cdot t$

where

$E$ is energy, in joules $J$

$P$ is power, in watts $W$

$t$ is time, in seconds $s$

$30$ min $= 30 \cdot 60 s$

$= 1800 s$

$E = 1000 W \cdot 1800 s$

$= 1 , 800 , 000 J$

$1 , 800 , 000 J = 1.8 M J$

($M$ stands for mega, ${10}^{6}$)