INTRODUCTION - Chapter 12 - Electricity & Circuits - Ncert Solutions class 6 - Science

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Question 1:

Fill in the blanks:

(a) A device that is used to break an electric circuit is called a ______ __.

(b) An electric cell has ______ __ terminals.

Answer:

(a) A device that is used to break an electric circuit is called a __switch__.

Switch:

A switch is an electric device that is used to break a circuit. When the switch is in ‘OFF’ position, then the circuit is not complete. Then, the circuit is called an open circuit. An electric current cannot flow through this circuit.

(b) An electric cell has __two__ terminals.

Two terminals:

An electric cell has two terminals, a negative terminal and a positive terminal (as shown in the given figure).

Question 2:

Mark ‘True’ or ‘False’ for the following statements:

(a) Electric current can flow through metals.

(b) Instead of metal wires, a jute string can be used to make a circuit.

(c) Electric current can pass through a sheet of thermocol.

Answer:

(a) True

Metals are good conductors of electricity. They allow an electric current to flow through them easily. Hence, an electric current can flow through metals.

(b) False

Jute string is a bad conductor of electricity. If jute string is used to make an electric circuit, then the current will not flow through it. Hence, strings made of jute cannot be used to make circuits.

(c) False

Thermocol is a bad conductor of electricity. Hence, electric current cannot pass through it.

Question 3:

Explain why the bulb would not glow in the arrangement shown in Fig.12.13.

Answer:

An electric current cannot pass through objects such as plastic scales, tester holders, etc., because these objects are bad conductors of electricity.

From the given figure, it can be observed that one terminal of the bulb is connected to a tester holder. A current will not flow through the circuit. Hence, the bulb would not glow.