If a 60 W light bulb in a bedside lamp is only 20 percent efficient in converting electrical energy into light energy, how many joules of light energy does this light bulb produce each time?
Thanks in advance!
Thanks in advance!
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each time what?
In a second, a 60 watt bulb uses 60 joules of energy, and at 20%, that means 12 J of light.
In 10 seconds, that is 120 J
in 60 sec, that is 720 J
In a second, a 60 watt bulb uses 60 joules of energy, and at 20%, that means 12 J of light.
In 10 seconds, that is 120 J
in 60 sec, that is 720 J