A galvanometer of internal resistance 50Ω and full scale deflection of 20 mA is converted
PHYSICS
WAEC 2010
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: D. 40V
Explanation
V = IR1 + IR2
= 0.02 x 50 + 0.02 x 1950 = 40V
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