Revision 1 Topic- Electricity

Electricity and Electric Current – Class 7 ICSE

Brief Note:
Electricity is a form of energy associated with electric charges inside atoms. Electric current is produced when free electrons move in a particular direction. Conventionally, current flows from the positive terminal to the negative terminal.

1. Electricity due to movement of charges is called

Static electricity Current electricity Nuclear electricity Thermal electricity

2. Which particle has negative charge?

Proton Electron Neutron Ion

3. The centre of an atom is called

Orbit Shell Nucleus Electron cloud

4. Free electrons are mainly present in

Metals Plastic Glass Rubber

5. Electric current is due to the flow of

Protons Neutrons Electrons Atoms

6. Conventional direction of current is from

Negative to positive Positive to negative Electron to nucleus Nucleus to electron

7. Which is a good conductor?

Rubber Plastic Copper Glass

8. Which is an insulator?

Aluminium Glass Human body Salt water

9. An atom is electrically neutral because

Neutrons are absent Protons equal electrons Only electrons exist Only protons exist

10. SI unit of electric current is

Volt ampere Ohm Watt