An auto mechanic needs to determine the emf and internal resistance of an old battery. He performs two measurements: in the first, he applies a voltmeter to the battery's terminals and reads 11.5 V; in the second, he applies an ammeter to the terminals and reads 15.5 A. What are the battery's emf E and internal resistance r?

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Q: As an auto mechanic, you need to determine the emf and internal resistance of an old battery. You…

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Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.