Select all that apply.
which of the following are appropriate units for power?

a) newton·meter
b) watt
c) h. p./sec
d) joule/sec

The correct answer to the question is B) watt and D) joule/sec.

EXPLANATION:

As per the question, the physical quantity given is power.

The power is defined as the rate of consumption of energy or the rate of doing work.

Let us consider W is the amount of work done by a body in time t .

Mathematically the power of that body is written as -

                                 power p =

The unit of work is joule and the unit of time is second.

Hence, the unit of power is joule/sec.

we know that one joule/sec. = one watt.

Hence, watt is also another unit of power.

newton-metre can not be a unit of power . It may be considered as a unit of work.

Similarly H.P/sec is also not a unit of power. Here H.P stands for horse power which is another unit of power .

Hence, joule/sec. and watt are the appropriate units of power.

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