PH-1989

Electrical power and energy

Physics · Secondary 4 · Medium · Electrical power and energy

A 40 W lamp is switched on for 2.5 hours. How much electrical energy does it use?

$3.6 \times 10^5\,\text{J}$
$1.0 \times 10^2\,\text{J}$
$6.0 \times 10^3\,\text{J}$
$3.6 \times 10^6\,\text{J}$

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