The current in the voltmeter that shows 120V is 15 mA, determine the resistance of the voltmeter.

univerkov | August 6, 2021 | education

To determine the desired resistance of the voltmeter used, apply Ohm’s law for the circuit section: I = U / R and R = U / I.

Variables: U – voltage, which is indicated by the used voltmeter (U = 120 V); I – current strength (I = 15 mA = 15 * 10 ^ -3 A).

Let’s perform the calculation: R = U / I = 120 / (15 * 10 ^ -3) = 8 * 10 ^ 3 Ohm = 8 kOhm.

Answer: The resistance of the used voltmeter is 8 kOhm.

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