For a cell, the terminal potential difference is 2.2 V when the circuit is open and is reduced to 1.8 V when the cell is connected to a resistance R = 5 Ω . Determine the internal resistance of the cell.

Question

For a cell, the terminal potential difference is 2.2 V when the circuit is open and is reduced to 1.8 V when the cell is connected to a resistance R = 5 Ω . Determine the internal resistance of the cell., 10 9 Ω, 9 10 Ω, 11 9 Ω, 5 9 Ω

MARKS App · Accepted Answer

When the circuit is open, Potential Difference = E = 2.2 V i = 2.2 r + 5 Potential difference across cell = E - i r 1.8 = 2.2 - 2.2 r + 5 × r ⇒ 2.2 r r + 5 = 0.4 ⇒ r = 2 1.8 = 10 9 Ω

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