Physics WAEC

A galvanometer of internal resistance 50Ω and full scale deflection of 20 mA is converted into a voltmeter by connecting a resistor of resistance 1950Ω in series to it. Calculate the maximum voltage that can be read by the voltmeter

A. 20V
B. 30V
C. 38V
D. 40V

Correct Answer: Option D

D. 40V

Explanation

V = IR1 + IR2

= 0.02 x 50 + 0.02 x 1950 = 40V

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