The voltmeter shown in the figure reads 18V across the 50Ω resistor. Find the resistance of the voltmeter.
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⚫The voltage across the 24 ohms resistor is 30 - 18 = 12 v
⚫The current flowing is 12 v / 24Ω = 0.5 A
⚫The current through the 50 Ω resistor is 18v / 50Ω = 0.36 A
⚫So the current through the voltmeter is 0.5A - 0.36 A = 0.14 A
⚫⚫The resistance of the voltmeter is 18 v / 0.14 A = 128.6 Ω
__________________________
⚫The voltage across the 24 ohms resistor is 30 - 18 = 12 v
⚫The current flowing is 12 v / 24Ω = 0.5 A
⚫The current through the 50 Ω resistor is 18v / 50Ω = 0.36 A
⚫So the current through the voltmeter is 0.5A - 0.36 A = 0.14 A
⚫⚫The resistance of the voltmeter is 18 v / 0.14 A = 128.6 Ω
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