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Chapter 21: Q16PE (page 775)

What is the output voltage of a 3.00 v lithium cell in a digital wristwatch that draws 0.300mv , if the cell's internal resistance is 2惟?

Short Answer

Expert verified

The terminal voltage is 2.9994 V.

Step by step solution

01

Terminal voltage

The terminal voltage of lithium cell is given as,

v=emf-IR

Here, emf is the output voltage of the battery, I is the current and R is the resistance

02

Calculation of the terminal voltage

Given,emfoflithiumcellis,E=3V.Current,I=0.3mA.Internalresistance,r=2惟Terminalvoltage,V=E-Ir=3V-0.3脳10-3A脳2惟=2.9994VTherefore,theterminalvoltageis2.999V.

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