Define electromotive force. A cell of e. m.f. E and internal resistancer was connected in series with two series
external resistors, A (of 8-ohms) and B (of 2-ohms). A high resistance voltmeter
connected across A was found to read Svolts. When another resistor C (of 8 ohms)
was connected parallel to A, and then across A and C. the voltmeter read 6 volts.
Draw the circuit diagrams of the two arrangements.

Calculate the internal resistance of the cell.
Calculate the e. m.f. of the cell.
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