PH-2348

Power

Physics · Secondary 4 · Hard · Power

An electric heater is rated at

500\,\text{W}

and is used for

30\,\text{min}

.

How much electrical energy does it use?

Use

E = Pt

.

$9.0\times10^5\,\text{J}$
$1.5\times10^4\,\text{J}$
$2.5\times10^2\,\text{J}$
$1.0\times10^7\,\text{J}$

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