Solve the following examples/ numerical problems.
If the current passing through a bulb is 0.2 A and the power of the bulb is 20 w., find the voltage applied across the bulb.

If the current passing through a bulb is 0.15 A and the power of the bulb is 30 w, find the voltage applied across the bulb.

When the voltage applied across a bulb is 220 v the current passing through the bulb is 0.1 A . Find the power of the bulb.

Solve the following examples/ numerical problems. A bulb of 40 w is connected across a source of 220 v. Find the resistance of the bulb.

Solve the following examples/ numerical problems. An electric bulb is connected to a source of 250 volts. The current passing through it is 0.27 A. What is the power of the bulb?

Solve the following examples (numerical problems): If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current?

Solve the following examples (numerical problems): A current of 0.1 A passes through a copper wire for 40 seconds. Find the charge flowing through the cross section of the wire during this time and the number of electrons carrying it. (The charge on an electron, q= -1.6 times 10^(-19) C)