Two electric bulbs are first connected in series and then in parallel. Derive expressions for effective power consumed in each case.

Two electric bulbs marked 220 V and 100 W are connected to the main source in parallel. What is the power consumed by the combination ?

n number of identical capacitors are first connected in series and then in parallel. Find the ratio of equivalent capacitance of two grouping

Derive an expressions for effective capacitance of capacitors connected in parallel.

Derive an expression for force between two parallel currents.