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WAEC Physics 2018 Paper

Question : 41

Total: 50

Solution:

Concept:

Current divides between parallel branches, so the main current equals the sum of the branch currents.

Explanation:

From the circuit,

A_3

records the total current entering the junction.

A_2

and

A_1

are the currents in the two parallel branches.

By Kirchhoff's current law:

A_3 = A_1 + A_2

Given

A_3 = 5\text{ A}

and

A_2 = 2\text{ A}

A_1 = A_3 - A_2 = 5\text{ A} - 2\text{ A}

A_1 = 3\text{ A}

Answer:

The reading of

A_1

3\text{ A}

, which is option B.

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