Kirchhoff's Loop Rule Video Lessons

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Problem: Unlike the idealized voltmeter, a real voltmeter has a resistance that is not infinitely large.(a) A voltmeter with resistance Rv is connected across the terminals of a battery of emf "EMF" and internal resistance r. Find the potential difference Vmeter measured by the voltmeter.(b) If emf = 7.50 v and r = 0.45 Ω, find the minimum value of the voltmeter resistance Rv for which the voltmeter reading is within 1.0% of the emf of the battery.

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FREE Expert Solution

1)

Kirchhoff's loop rule:

ΣV=0

ε-ir-iRv=0

i = Vmeter/Rv

84% (273 ratings)
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Problem Details

Unlike the idealized voltmeter, a real voltmeter has a resistance that is not infinitely large.
(a) A voltmeter with resistance Rv is connected across the terminals of a battery of emf "EMF" and internal resistance r. Find the potential difference Vmeter measured by the voltmeter.
(b) If emf = 7.50 v and r = 0.45 Ω, find the minimum value of the voltmeter resistance Rv for which the voltmeter reading is within 1.0% of the emf of the battery.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Kirchhoff's Loop Rule concept. You can view video lessons to learn Kirchhoff's Loop Rule. Or if you need more Kirchhoff's Loop Rule practice, you can also practice Kirchhoff's Loop Rule practice problems.

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