Unlike the idealized voltmeter, a real voltmeter has a resistance that is not infinitely large. part a a voltmeter with resistance rv is connected across the terminals of a battery of emf e and internal resistance r. find the potential difference vmeter measured by the voltmeter.

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Physics

Yandel Oliver

1 March, 08:34

Unlike the idealized voltmeter, a real voltmeter has a resistance that is not infinitely large. part a a voltmeter with resistance rv is connected across the terminals of a battery of emf e and internal resistance r. find the potential difference vmeter measured by the voltmeter.

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Amelia Waters · Answer 1

The EMF of the battery includes the force to to drive across its internal resistance. the total resistance:

R = internal resistance r + resistance connected rv

R = r + rv

Now find the current:

V 1 = IR

I = R / V1

find the voltage at the battery terminal (which is net of internal resistance) using

V 2 = IR

So the voltage at the terminal is:

V = V2 - V1

This is the potential difference vmeter measured by the voltmeter.