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Q. 19

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
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Short Answer

The voltage across the terminals of a battery is when the battery is connected to a load. What is the battery’s internal resistance?

The battery's internal resistance is .

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Step by Step Solution

Step 1: Given Information  

We have to find the internal resistance of the battery.

Step 2: Simplify 

The resistor is connected to the battery, a voltage drop occurs which is . This is the potential difference across the resistor . So, determine the current through the circuit by using Ohm's law by

A battery that is connected to a circuit, the current that flows through the circuit is given by equation in the form

Where is the emf of the battery which is . Solve the equation for to be

Putting the values for and into equation to get by

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