Define electric potential and potential difference.

What is the role of the earth wire in domestic circuits?

State Ohm’s law.

Distinguish between the resistivity and conductivity of a conductor.

What connection is used in domestic appliances and why?

An electric iron consumes energy at the rate of 420 W when heating is at the maximum rate and 180 W when heating is at the minimum rate. The applied voltage is 220 V. What is the current in each case?

A 100 watt electric bulb is used for 5 hours daily and four 60 watt bulbs are used for 5 hours daily. Calculate the energy consumed (in kWh) in the month of January.

A torch bulb is rated at 3 V and 600 mA. Calculate it’s
a) power
b) resistance
c) energy consumed if it is used for 4 hour.

A piece of wire having a resistance R is cut into five equal parts.
a) How will the resistance of each part of the wire change compared with the original resistance?
b) If the five parts of the wire are placed in parallel, how will the resistance of the combination change?
c) What will be ratio of the effective resistance in series connection to that of the parallel connection?