Question

find energy in Kwh,if the power is 200W bulb used in 30 min?

Answer 1

Pikachu! Your answer ^^
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The formula of energy is Power * time

200 w = 0.2 kw

30 minutes = 0.5 hour

So energy = 0.2 * 0.5 = 0.1 kwh 

Note that the unit of energy is joule but according to the question my answer is fitting right ^^
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Pikachu! ^_~