Question

3) Which of the following is not a unit of power?
a) VA b) Js c) KW d) Wh​

Answer 1

Option b) Js and d) W hr are not units of power .

Let's see how !!

For 1st option :

• We know that : Potential Difference is work done divided by charge.

$V = \dfrac{W}{q}$

$\implies \: W = V \times q$

$\implies \: \dfrac{W}{t} = \dfrac{V \times q}{t}$

$\implies \: power= V \times \dfrac{ q}{t}$

$\implies \: power= V \times i$

So, put the SI UNITS :

$\implies \: power= V olt \times ampere$

$\boxed{ \implies \: power= V \: A}$

For 3rd option :

• kW means kilo-watt or 10³ watt.

• Watt is the SI unit of power.

So, the rest options [i.e. option b) and d)] are not power units

Answer 2

Answer:

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