Question

How is the range of a voltmeter changed when the resistor's resistance is increased?

   How is the range of a voltmeter changed when the resistor's resistance is increased?

Physics Principle and Problems

Physics Principle and Problems

Paul W. Zitzewitz,… 1st Edition

Chapter 24, Problem 55

Instant Answer

Solved by Expert Averell Hause

06/01/2020

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This can be represented as: \[ V \propto R \] where V is the voltage. Show more…

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How is the range of a voltmeter changed when the resistor's resistance is increased?

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Key Concepts

Voltage Divider Principle

This principle explains how the voltage is distributed across resistors connected in series. When a multiplier resistor is used with a voltmeter, the total voltage across the combination is divided between the internal resistance and the added resistor, dictating the effective range of the measurement.

Measurement Range

The maximum voltage the instrument can accurately measure depends on the configuration of its components, including the internal resistance and any added multiplier resistor. Adjustments to resistor values directly affect this range, allowing for a trade-off between sensitivity and maximum measurable voltage.

Voltmeter Internal Resistance

This is the inherent resistance of the voltmeter itself, designed to be very high to minimize the loading effect on the circuit. Its value is a critical factor in how the instrument interacts with the measured circuit and plays a key role in setting the measurement parameters.

Multiplier Resistor

A resistor used in series with a voltmeter to expand its range. By incorporating an additional resistor, the voltage divider created allows the voltmeter to measure higher voltages than it could on its own, without causing damage or impacting accuracy.

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