Question

# An electric heater is rated 1500 W. How much energy does it use in 10 hrs.?

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Hint : Given the power rating of the given meter, use the formula to find the energy it consumes by directly finding the product of power rating and time it runs for. 1-watt hour is equal to 3600 Joules. Convert Watt-hour to joules, which is the standard unit for energy.
$\Rightarrow E = 54MJ$ ( $1MJ = {10^6}J$ )
Thus the total energy consumed is 54 MegaJoules.

$E = P \times t$ , Where P is the rated power of the object, and t is the time period that machine runs for.
$\Rightarrow E = 1500 \times 10$
$\Rightarrow E = 15000Wh$
$\Rightarrow E = 54MJ$ ( $1MJ = {10^6}J$ )