Physics JAMB

A cell of emf 1.5V is connected in series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell
A cell of emf 1.5V is connected in series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cellA cell of emf 1.5V is connected in series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell

A. 4.0Ω
B. 3.0Ω
C. 1.5Ω
D. 1.0Ω

Correct Answer:

Option A – 4.0Ω

Explanation

r = E/I−R

r = (1.5/0.3)−1

r = 4Ω

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