harrycol123 harrycol123

09-05-2018
Physics

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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. The rest of the energy is wasted calculate the efficiency of the light bulb

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Аноним Аноним

09-05-2018

30*t=600
t=20 second

450=20*w
w=45/2

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