We know a voltmeter must be connected in parallel, but what does that imply about its internal resistance? Is it really big, or really small? If the voltmeter is connected in series (don't do that!), how does it affect the circuit? Include a sketch to illustrate your reasoning.

We know a voltmeter must be connected in parallel, but what does that imply about its internal resistance? Is it really big, or really small? If the voltmeter is connected in series (don't do that!), how does it affect the circuit? Include a sketch to illustrate your reasoning.

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter22: Electric Current

Section: Chapter Questions

Problem 47A

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Concept explainers

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

Question

We know a voltmeter must be connected in parallel, but what does that imply about its internal resistance? Is it
really big, or really small? If the voltmeter is connected in series (don't do that!), how does it affect the circuit?
Include a sketch to illustrate your reasoning.

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