V = EMF - I r
Where:
V = terminal voltage (internal potential difference)
EMF = 24 V (electromotive force)
r = 4 ohms (internal resistance)
R = 32 ohms (external resistor)
Calculate the current
I = EMF / (R + r) = 24 / (32 + 4) = 24 / 36 = 0.6667 A
Calculate the internal potential difference
V = EMF - I r = 24 - (0.6667 × 4) = 24 - 2.6667 = 21.33 V
Answer: 21.33 V

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