Match the following. A B 1. Cell a) Used to open or close a circuit. 2. Switch b) Safety device used in electric circuit. 3. Circuit c) A complete path for the flow of an electric current. 4. Miniature Circuit Breaker d) Reset by hand, circuit becomes complete once again. 5. Fuse e) A device which converts chemical energy into electrical energy.

1. (e) An electrical cell is a device that is used to generate electricity. It converts chemical energy into electrical energy. An electrical current always flows from the positive terminal of a cell to the negative terminal of the cell. 2. (a) A switch is a device that is used for making (close) and breaking (open) the connection in an electric circuit. When the switch is in the on position, then the electric current flows through the circuit. 3. (c) The electric current travels on a closed path called the circuit. It includes various electrical components, such as resistors, transistors, and capacitors. 4. (d) Miniature Circuit Breakers (MCB) are switches that automatically turn off when the current in a circuit exceeds the safe limit. It has a switch that goes off automatically if there is any overloading. It does not need replacement. It can be reset. It works on the magnetic effect of electric current. 5. (b) When excessive electric current flows through a circuit, the wires may get heated and can catch fire. To avoid fire, a safety device known as a fuse is connected in series in the circuit. It is made of an alloy of lead and tin. A B 1. Cell e) A device which converts chemical energy into electrical energy. 2. Switch a) Used to open or close a circuit. 3. Circuit c) A complete path for the flow of an electric current. 4. Miniature Circuit Breaker d) Reset by hand, circuit becomes complete once again. 5. Fuse b) Safety device used in electric circuit.

E M B I B E

Science Class - 7>Chapter 7 - Electricity Current - It's Effect>Improve your learning>Q 10

MEDIUM

7th Telangana Board

IMPORTANT

Earn 100

Draw the symbols for the electrical components in the table.

S.No. Electric Components Symbol

1 Cell

2 Electric bulb

3 Electric switch

4 Battery

Important Questions on Electricity Current - It's Effect

EASY

7th Telangana Board

IMPORTANT

Science Class - 7>Chapter 7 - Electricity Current - It's Effect>Improve your learning>Q 11

Draw the circuit diagram for the following series connection.

Question Image

HARD

7th Telangana Board

IMPORTANT

Science Class - 7>Chapter 7 - Electricity Current - It's Effect>Improve your learning>Q 12

Match the following.

A	B
1. Cell	a) Used to open or close a circuit.
2. Switch	b) Safety device used in electric circuit.
3. Circuit	c) A complete path for the flow of an electric current.
4. Miniature Circuit Breaker	d) Reset by hand, circuit becomes complete once again.
5. Fuse	e) A device which converts chemical energy into electrical energy.