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Electromotive Force is defined as
If a 6 V cell supplies a current of 0.3 A to a 19 Ω resistor, find the internal resistance of the battery.
A cell has internal resistance of 1Ω. The potential difference across the cell is 5V when a current of 2A flows through it. Find the e.m.f. of the cell.
A cell with e.m.f. 6V and internal resistance, 1Ω is connected to a 5Ω resistor, and a voltmeter is connected across the resistor as shown in the diagram. Find the reading of the voltmeter.