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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

A battery haring an emf of 9.00 V delivers 117 mA when connected to a 72.0-Ω load. Determine the internal resistance of the battery.

To determine
The internal resistance of the battery.

Explanation

Given Info: The emf of battery is 9.00V , current through the circuit is 117mA and the load resistance is 72.0Ω .

Explanation:

Formulae to calculate the internal resistance is,

ΔV=I(R+r)

  • ΔV is the emf of the battery,
  • I is the current,
  • R is the load resistance,
  • r is the internal resistance,

Rewrite the above relation in terms of r.

ΔV=IR+IrIr=ΔVIRr=ΔVIR

Substitute 9.00V for ΔV , 117mA for I and 72

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