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12-05-2021
Physics

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A 300W hot plate produces 45,000 J of thermal energy while operating for 2 min. What is the efficiency of this devide? it need to be 80%, 67% 0.8% or 0.67%

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keijosalonen keijosalonen

12-05-2021

Answer:

Explanation: P = 300 W and t = 2 min = 120 s

Energy Q = Pt = 300 W · 120 s = 36 000 J.

Thus, plate can not produce 45 000 J heat.

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