1. The problem statement, all variables and given/known data 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) 2. Relevant equations P = E/T Efficiency = Eout/Ein x 100% 3. 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.