Calculate the combined resistance in each case:

Resistances of two coils of wire are 3 Omega and 6 Omega . If these coils be connected is (i) series and in (ii) parallel combination, then what will be the equivalent resistance in each case ?

Three resistors each of resistance 10 ohm are connected, in turn, to obtain (i) minimum resistance (ii) maximum resistance. Complete (a) The effective resistance in each case (b) ratio of minimum to maximum resistance so obtained.

Four resistors of resistances 5 Omega each are connected in parallel. Calculate the effective resistance of the combination.

Two resistors of resistance 4 ohm and 12 ohm are connected in series. Calculate the values of effective resistance in each case.

Two resistors of resistance 4 ohm and 12 ohm are connected in parallel. Calculate the values of effective resistance in each case.