Q 13.1: How many electrons pass through an electric bulb in one minute if the 300 mA current is passing through it?

Q 13.2: A charge of 90 C passes through a wire in 1 hour and 15 minutes. What is the current in the wire?

Q 13.3: Find the equivalent resistance of this circuit, total current drawn from the source and the current through each resistor.

Q 13.4: A rectangular bar of iron is 2cm by 2cm in cross section and 40cm long. Calculate its resistance if the resistivity of iron is 11 * 10(-8) ohm-meter.

Q 13.5: The resistance of an iron wire at 0 degree is 1 * 10(4) ohm. What is the resistance at 500 degree if the temperature coefficient of resistance of iron is 5.2 * 10(-3) per kelvin?

Q 13.6 Calculate terminal potential difference of each of cells in circuit of fig. p. 13.6.

Q 13.7: Find the current which flows in all the resistances of the circuit of fig. P. 13.7.

Q 13.8 Find the current and power dissipated in each resistance of the circuit, shown in Fig. P. 13.8.