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JAMB Physics 2018 Paper

Question : 6

Total: 87

What is the resultant resistance of the circuit in the image shown?

Solution:

Concept:

Series resistors add together, while parallel resistors combine by product over sum.

Explanation:

The branch containing

3\ \Omega

and

6\ \Omega

is in series, so its resistance is

3 + 6 = 9\ \Omega

This

9\ \Omega

is in parallel with the other

6\ \Omega

resistor.

Thus,

R = \frac{9 \times 6}{9 + 6} = \frac{54}{15} = 3.6\ \Omega

Answer:

3.6\ \Omega

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