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Q.

Which of the following is an expression of power?

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a

W/t  

b

 All of the given options

c

VQ/t

d

VI

answer is D.

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Detailed Solution

Power is defined as the rate of doing work. So, the formula is W/t.

Now, if electrical power is considered then the formula of work/energy is given by VIt. Now the formula of electrical power becomes VI.

In case we put the formula of current, I = Q/t, the formula of power becomes P = VQ/t.

Hence, all the first three options are correct.

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