Electrical 44931

A current of 20 A passes through the heating spiral of the electric fireplace with a resistance of 10Ω for 2.5 hours. Determine the power input of the fireplace and the consumed electrical energy

Correct answer:

P =  4000 W
W =  10000 Wh

Step-by-step explanation:

$$\begin{gathered} R=10\Omega \\ I=20\text{A} \\ t=2.5\text{h} \\ P=R\cdot I^2=10\cdot 20^2=4000\text{W} \end{gathered}$$

$W=P\cdot t=4000\cdot 2.5=10000\text{Wh}$

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