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WAEC - Physics (2010 - No. 38)

A galvanometer of internal resistance 50\(\Omega\) and full scale deflection of 20 mA is converted into a voltmeter by connecting a resistor of resistance 1950\(\Omega\) in series to it. Calculate the maximum voltage that can be read by the voltmeter
20V
30V
38V
40V

Vysvětlení

V = IR1 + IR2

= 0.02 x 50 + 0.02 x 1950 = 40V

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