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The emf of a flashlight battery is roughly constant with time, but its internal resistance increases with age and use. What sort of meter should be used to test the freshness of a battery?

Short Answer

Expert verified

An ohmmeter is used to test the freshness of a battery.

Step by step solution

01

Determining the type of meter

An Ohmmeter is used to directly test the battery's internal resistance.

If the short circuit current is measured with an ammeter, the internal resistance may be computed using Ohm's law using the measured current and the battery's electromotive force (ε).

r=slsc

Hence, an Ohmmeter is used to test the freshness of a battery.

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