Grade 7 - Science -Lesson 3 Assignment 1

Soures of Electricity

Electricity plays a very large role in our lives. Various electric appliances are used to ease our daily work.

01.Complete the table.

Name of the                                                                 Use                        Electricity is supplied by electrical equipment

1.Electric clock                                                    To know the time             Electric cells

2. Rice cooker

3. Water pump

4. Head lamp of bicycle

5. Vehicle-battery

6. Electric heater

7. Pocket radios

8. Mobile phones

9. Calculators

10. Torches

02. Devices that generate electricity are known as sources of electricity. Devices that generate electricity can be classified according to the way they generate electricity.

a) Generating electricity by chemical reactions.

b) Generating electricity by rotational movements.

c) Generating electricity using kinetic energy.

Write down the method by which the following sources produce electricity.

1. Dry cell  -

2. Car battery  -

3. Bicycle dynamo  -

4. Electrical Generator  -

5. Solar panel  -

6. Simple cell  -

03. Draw a named diagram to show the generation of electricity using a lime fruit and write down the observations from the experiment.

04. Draw the diagram of a simple cell and name the parts.