For a cell, terminal potential difference is 2.2 V when circuit is open. If it reduces to 1.8 V when the cell is connected to a resistance of 5Ω . The internal resistance of cell ( r ) is then:NEET 20

Question

For a cell, terminal potential difference is 2.2 V when circuit is open. If it reduces to 1.8 V when the cell is connected to a resistance of 5Ω . The internal resistance of cell ( r ) is then:NEET 2002

TestHub · Accepted Answer

Terminal potential difference ​ V = E − I r ∴ V = E − [ R − r E ​ ] r = R + r ER ​ ​ From given condition = E = 2.2 and where R = 5 then potential V = 1.8 V Therefore 1.8 = 5 + r 2.2 × 5 ​ ⇒ r = 9 10 ​ Ω

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