Two electric bulbs P and Q have their resistances in the ratio of 1: 2. They are connected in series across a battery. Find the ratio of the power dissipation in these bulbs.

Two cubes have their volumes in the ratio 1:27. the ratio of their surfacs area is

Two resistances are inthe ratio of 1:4.If these are connected in parallel, their total resistance becomes 16 Omega . Find the value of each resistance.

An inductor of reactance 1 Omega and a resistor of 2 Omega are connected in series to the terminals of a 6 V(rms) a.c. source. The power dissipated in the circuit is.

Two metallic rods each of length L, area of cross A_1 and A_2 , having resistance rho_1 and rho_2 are connected in parallel across a d.c. battery. Obtain the expression for the effective resistivity of this combination.

Two resistance filaments of same length are connected first in series and then in parallel. Find the ratio of power dissipated in both cases assuming that equal current flows in the main circuit.

Find the ratio of resistances when two heater wires of equal lengths are first connected is series and then in parallel.

Two resistors are in the ratio 1:4. If these are connected in parallel, their total resistance becomes 20Omega . Find the value of each resistance.