A cell of e.m.f. 1.5v is connected in series with a resis...
A cell of e.m.f. 1.5v is connected in series with a resistor of 3Ω. A high resistance voltmeter connected across the cell registers only 0.9v. Calculate the internal resistance of the cell
5.0Ω
4.5Ω
2.4Ω
2.0Ω
1.8Ω
Correct answer is D
E.M.F (E) = 1.5v, Internal Resistance (r) = ?, Potential Difference (V) = 0.9v, Load resistance (R) = 3Ω,
Current (I) = V / R = 0.9 / 3 = 0.3A
USING : E = I ( R + r )
r = (E / I) - R = (1.5 / 0.3) - 3
r = 5 - 3
r = 2Ω,
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