Worksheets on Electricity

Electricity Worksheet-1

1. A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R', then the ratio R/R' is :

A. 1/25               B. 1/5                  C. 5                      D. 25

2. Which of the following terms does not represent electrical power in a circuit:

A. I²R                  B. IR²                  C. VI                  D. V²/R

Electricity Worksheet-2

1. The resistance of a straight conductor is independent of:

A. temperature                             B. material

C. cross-sectional area                D. shape of cross-section.

2. The resistivity of a wire :

A. varies with its length

B. varies with its cross-section

C. varies with its mass

D. is independent of length, cross-section and mass of the wire.

Electricity Worksheet-3

1. A conductor carries a current of 0.2 A. Find the amount of charge that will pass through the cross-section of the conductor in 30 s. How many electrons will flow in this time interval if the charge on one electron is 1.6 × 10^–19 C ?

2. The filament of an electric lamp draws a current of 0.4 A which lights for 3 hours. Calculate the amount of charge that flows through the circuit.

3. An electric iron draws a current of 0.5 A when voltage is 200 V. Calculate the amount of charge flowing through it in one hour.

4. N electrons flow through a cross-section of a conductor in time t. if the charge on an electron is e, write an expression for the current in the conductor.