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Questions on EMF and internal resistance

Q3.

A battery of e.m.f. 12 V and internal resistance r is connected in a circuit with three resistors each having a resistance of 10 as shown. A current of 0.50A flows through the battery.

Calculate

(i) the potential difference between the points A and B in the circuit,

(ii) the internal resistance of the battery,

(iii) the total energy supplied by the battery in 2.0 s,

(iv) the percentage of the energy supplied by the battery that is dissipated within the battery.

(7)
(Total 7 marks)