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(a) Figure 13, shows a cell in series with a 3 Ohms resistor and a switch. A high resistance voltmeter is connected across the cell. The voltmeter reads 1.5V with the switch open and 1.2V with the switch closed.
(i) State the electromotive force of the cell.
(ii) Determine the current through the 3 Ohms resistor when
the switch is closed. (iii) Determine the internal resistance of the cell.
(b) Another resistor R is connected in series with the 3Ω resistor so that a current of 0.15A flows when the switch is
closed.
Determine the resistance of R.