A bulb takes in 40 watts power but it give the light of 20watts. What is the efficiency?
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Explanation:
efficiency is
the light energy in not been given to the tungsten wire properly
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A watt unit is equal to 1 joule/sec.
So you have a lightbulb with 50% efficiency, so it turns half the energy it consumes into light energy.
20 joules/second.
In 10 seconds, it gives off 20*10 joules of energy.
Carry the multiplication, and you get that it gives off 200 joules of energy in 10 seconds.
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