A machine does 400 Joules of work in 20 seconds. What is the power of the machine in Watts?

C. 20 W — Power is defined as the rate of doing work, which is work divided by time. Dividing 400 Joules by 20 seconds results in 20 Watts.

JEE Advanced · PhysicsEasy

$A machine does W = 400 J of work in t = 20 s . What is the power P in Watts?$

A. $40 W$
B. $8000 W$
C. $20 W$
D. $10 W$

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Correct answer: C — $20 W$

Solution

Power is defined as P = \frac{W}{t} . Dividing 400 J by 20 s results in P = 20 W .

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A machine does W=400 J of work in t=20 s. What is the power P in Watts?

Solution

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$A machine does W = 400 J of work in t = 20 s . What is the power P in Watts?$