You are given a cell of e.m.f 1.5 V and two wires each of resistance 6 ohm and a key. Draw the circuit diagram to get the maximum current in the circuit using these.

5 cells each of e.m.f 1.5 V and internal resistance 0.1 Omega are connected in such a manner that the current in an external resistor of 10 Omega is maximum. Draw the circuit diagram of the combination and calculate the current in the circuit.

The current in a circuit with a cell of e.m.f 6 V and internal resistance 0.1 Omega is 2 A. Find the value of the external resistance in it.