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WAEC Physics 2021 Paper

Question : 19

Total: 50

Which of the following units is equivalent to the unit of electric current?

Solution:

Concept:

Electric current is the rate of flow of electric charge.

Explanation:

From the definition, charge

Q

is related to current

I

and time

t

by:

Q = It

So,

I = \frac{Q}{t}

The unit of charge is the coulomb (

\mathrm{C}

) and the unit of time is the second (

\mathrm{s}

Therefore,

I = \frac{\mathrm{C}}{\mathrm{s}} = \mathrm{C\,s^{-1}}

This is equivalent to the ampere, the unit of electric current.

Answer:

\mathrm{C\,s^{-1}}

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