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Homework Statement
An incandescent bulb is only 5.0% efficient. How much waste thermal energy is porudced by a 100.0W bulb in 1.0h? (Anwer=95J)
Homework Equations
P = E/T
Efficiency = Eout/Ein x 100%
The Attempt at a Solution
P = E/T
E = PT
= (100)(1)
= 100J
Eff=Eout/Ein
0.95=Eout/100
Eout= 95J
This is the correct answer, but why is time in hours? Shouldn't it be in seconds (1h=3600s) so the equation becomes:
E = PT
= (100)(3600)
= 360000
This is the wrong answer, but I don't understand why time isn't measured in seconds as the SI unit is Seconds for time.
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