Chapter 18, Problem 1P

### College Physics

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

Chapter
Section

### 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 9.00â€‰V , current through the circuit is 117â€‰mA and the load resistance is 72.0â€‰Î© .

Explanation:

Formulae to calculate the internal resistance is,

Î”V=I(R+r)

• Î”V 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.

Î”V=IR+IrIr=Î”Vâˆ’IRr=Î”VIâˆ’R

Substitute 9.00â€‰V for Î”V , 117â€‰mA for I and 72

### Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

#### The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started