PH-1979

Electrical power and energy

Physics · Secondary 4 · Medium · Electrical power and energy

A 1.5 V cell is connected across a 5.0 Ω resistor. How much electrical energy is converted in the resistor in 20 s?

(Assume the cell maintains 1.5 V.)

$9.0\,\text{J}$
$0.45\,\text{J}$
$30\,\text{J}$
$225\,\text{J}$

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