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JAMB Physics 2023 Paper

Question : 7

Total: 65

Solution:

Concept:

The terminal p.d. is the voltage across the external resistor only, not the full emf of the battery.

Explanation:

Given: emf

\varepsilon = 24.0 \, \text{V}

, internal resistance

r = 1.0 \, \Omega

, external resistance

R = 5.0 \, \Omega

Using the emf equation:

\varepsilon = I(R + r)

Solve for current:

I = \frac{\varepsilon}{R + r} = \frac{24.0}{5.0 + 1.0} = \frac{24.0}{6.0} = 4.0 \, \text{A}

Terminal p.d. is the voltage across

R

V = IR = 4.0 \times 5.0 = 20.0 \, \text{V}

Answer:

20.0 \, \text{V}

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