how much electrical energy will be converted to light energy by a 60 watt bulb is is switched on for 30 minutes
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Power = Work done / time
Work done = Energy
In our case :
Power = 60 watts
Time = 30 minutes
We need Energy
Energy = power × time
The time should be in seconds.
Therefore :
30 × 60 = 1800 seconds
Energy = 1800 × 60 = 108000 Joules
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