Worksheets on Electricity

Electricity Worksheet-25

1. A wire 1.0 m long, 2.0 mm in diameter, has a resistance of 10 Ω. Calculate the resistivity of its material.

2. Calculate the area of cross – section of a wire if its length is 1.0m, its resistance is 23 Ω and the resistivity of the material is 1.84 × 10^–6 Ω m.

3. Calculate the resistance of an electric bulb which allows a 10 A current when connected to a 220 V power source.

4. A lamp rated 100 W at 220 V is connected to the mains electric supply. What current is drawn from the supply line if the voltage is 220 V ?

5. Calculate the electric energy consumed by a 1200 W toaster in 20 minutes.

Electricity Worksheet-26

1. Draw a schematic diagram of a circuit consisting of a battery of five 2 V cells, a 5 Ω resistor, a 10 Ω  resistor and a 15 Ω resistor, and a plug key, all connected in series.

2. In a household, 5 tube lights of 40 W each are used for 5 hours and an electric press of 500 W for 4 hour each day. Calculate the total energy consumed by the tube lights and press in a month of 30 days.

3. In the circuit shown in the Fig calculate :

(a) total resistance in arm CE, (b) total current drawn from the battery, and (c) current in each arm, i.e., AB  and CE of the circuit.