Worksheets on Electricity

Electricity Worksheet-16

1. Why is tungsten used almost exclusively for filament of incandescent lamps ?

2. Why are the conductors of electric heating devices, such as toasters and electric irons, made of an alloy rather than a pure metal ?

3. Why is the series arrangement not used for domestic circuits ?

4. How does the resistance of a wire vary with its cross-sectional area ?

5. Why are copper and aluminium wires usually employed for electricity transmission.

6. What is meant by quantization of charge ?

Electricity Worksheet-17

1. A wire of resistivity p is stretched to double its length. What is its new resistivity ?

2. How many times (roughly) is the resistivity of an insulator greater than a metal ?

3. What is the resistance of a connecting wire ?

4. What is the resistance of an ammeter ?

5. What is the resistance of a voltmeter?

6. Which has more resistance : 100 W bulb or 60 W bulb ?

Electricity Worksheet-18

1. How will you join three resistances, each of 2 Ω  so that the effective resistance is 3 Ω?

2. On what factors does the resistivity of a material depend ?

3. What happens to the current in a circuit if its resistance is doubled ?

4. What happens to the resistance of a circuit if the current through it is doubled ?

5. What happens if the potential difference across a resistance is doubled ?

6. How does the resistance of a wire depend upon its radius ?