When a resistance of 2 ohm is connected

Asked by admin @ 26/08/2021 in Physics viewed by 336 People

when a resistance of 2 ohms is connected across the terminals of a cell the current is 0.5 amperes,when the resistance is increased to 5 ohms, the current is 0.25 amperes. the internal resistance of the cell is

Answered by admin @ 26/08/2021

When a resistance of 2Ω is connected across the terminals of a cell, the current is 0.5 A. When resistance is increased to 5Ω, the current is 0.25 A.

The emf of the cell is V= it, v= .5*(r+2)= (1/2)*(r+2), when resistance is increased to 5, then v= .25*(r+5)= (1/4)*(r+5), from above equations, (1/2)*(r+2)= (1/4)*(r+5), 2r+4= r+5, r= 1 ohm

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When a resistance of 2 ohm is connected

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