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Ipatiy [6.2K]
3 years ago
10

A 30w light bulb uses 600J of electrical energy in a certain period of time. In that time , it produces 450 J of light energy. T

he rest of the energy is wasted calculate the efficiency of the light bulb
Physics
1 answer:
Effectus [21]3 years ago
7 0
30*t=600
t=20 second

450=20*w
w=45/2
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