A battery of three cells in series, each of e.m.f. 2 V and internal resistance 0.5 2 is connected to a 2ohms resistor in series with a parallel combination of two 3 ohms resistors. Draw the circuit diagram and calculate: a. the effective external resistance b.the current in the circuit c.the lost volts in the battery d. the current in one of the 3 ohms resistors.