Question

an electric fan runs from the 220 v mains .the current flowing through it is 0.5A.At what rate is the electrical energy transformed by the fan ? how much energy is transformed in 2min?

Answer 1

V = 220v
I = 0.5A
rate of energy transferred= power= V×I
P = 220*0.5 = 110 J/s

energy transferred in 2 min or 120 sec = 120*110 = 13200 j = 13.2 kJ

Answer 2

Heya ,

Here is ur solution .........

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Potential difference = 220 v
current flows = 0.5 A
and time = 2 min
$= > 2 \times 60 \: \: seconds \\ = > 120 \: \: seconds$
Energy transferred p = v × I
$= > p = 220 \times 0.5 = 110 \: j \\ \\ so \: \: \: \: p = 110 \: j \times seconds \\ = > p = 110 \times 120 \\ = > p = 13200 \: j$

so,
the Energy transferred in 13200 joules energy is transferred in 2 min .
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