NCERT Solutions for Chapter 12 Electricity and circuits Class 6 Science

Short Notes for Class 6 Science Chapter 12 Electricity and circuits

Electric cell is a source of electricity. An electric cell has two terminals; one is called positive (+ ve) while the other is negative (– ve). An electric bulb has a filament that is connected to its terminals.  An electric bulb glows when electric current passes through it. In a closed electric circuit, the electric current passes from one terminal of the electric cell to the other terminal. Switch is a simple device that is used to either break the electric circuit or to complete it. Materials that allow electric current to pass through them are called conductors. Materials that do not allow electric current to pass through them are called insulators.

Electricity and circuits Questions and Answers

 Chapter Name Electricity and circuits NCERT Solutions Class CBSE Class 6 Textbook Name Science Related Readings NCERT Solutions for Class 6NCERT Solutions for Class 6 ScienceSummary of Electricity and circuits

Question 1: Fill in the blanks:

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

(b) An electric cell has __________ terminals.

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

(b) An electric cell has two terminals.

Question 2: Mark 'True' or 'False' for 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 thermo Col.

(a) Electric current can flow through metals. (True)

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

(c) Electric current can pass through a sheet of thermo Col. (False)

Question 3: Explain why the bulb would not glow in the arrangement shown in Fig. 12.13.

The handle of screw is made up of insulator, which does allow to current to flow. That is why the bulb is not glowing.

Question 4: Complete the drawing shown in Fig 12.14 to indicate where the free ends of the two wires should be joined to make the bulb glow.

Question 5: What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.

A switch is a simple device that either breaks the circuit or completes it. The switches used in lighting of electric bulbs and other devices in homes work on the same principle. In radio, TV, mobiles, torch and electric toys have in built switches.

Question 6: Would the bulb glow after completing the circuit shown in Fig. 12.14 if instead of safety pin we use an eraser?

Eraser is insulator, so circuit will not complete. As a result the bulb will not glow.

Question 7: Would the bulb glow in the circuit shown in Fig. 12.15?

Both the wire are connected to only one terminal of the bulb, so current will not flow through the bulb and it would not glow. We should make a correction as follows:

Question 8: Using the "conduction tester" on an object it was found that the bulb begins to glow. Is that object a conductor or an insulator? Explain.

Since the object allows current to flow and completes the circuit and makes bulb to glow. It means the object is a conductor of electricity.

Question 9: Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.