Electricity and Circuits is Chapter 12 taken from JKBOSE Class 6 Science. You will get short notes and question answers in the chapter Electricity and Circuits in this post. The previous post was about Chapter 11 Light, Shadows and Reflections Question Answers. Let’s get started by having an overview of what you have studied in this chapter. You have studied about following topics in detail in this chapter:
Electricity and Circuits Class 6 Question Answers
Overview of Chapter
- ELECTRIC CELL.
- A BULB CONNECTED TO AN ELECTRIC CELL.
- AN ELECTRIC CIRCUIT.
- ELECTRIC SWITCH.
- ELECTRIC CONDUCTORS AND INSULATORS.
ELECTRIC CELL: An electric cell is a device which is used to produce a small amount of electricity due to chemical reactions. Electric cells are used as a source of electricity in clocks, wristwatches transistor radios, cameras, mobile phones, toys and many other items.
A BULB CONNECTED TO AN ELECTRIC CELL: A bulb when connected to an electrical cell will not glow if:
- The circuit is not complete.
- The bulb is fused.
- Connections are loose.
AN ELECTRIC CIRCUIT: It is the path through which electric current flows. An electric circuit contains components like an electric bulb, electric switch, and bulb.
ELECTRIC SWITCH: It is a simple device used to make or break an electric circuit. Electric switches are used to turn on or turn off electrical appliances in our homes.
ELECTRIC CONDUCTORS AND INSULATORS: Those substances which allow an electric current to pass through them are termed conductors of electricity. For example, copper, silver, aluminium, iron etc. Those substances which do not allow an electric current to pass through them are called insulators. For example, wood, plastic, rubber, paper, leather etc. Now let us move on to solutions.
Electricity and Circuits Class 6th Questions
- Fill in the blanks:
- A device that is used to break an electric circuit is called an electric switch.
- An electric cell has two terminals.
- Mark ‘True’ or ‘False’ for the following statements:
- Electric current can flow through metals. (True)
- Instead of metal wires, a jute string can be used to make a circuit. (False)
- Electric current can pass through a sheet of thermocol. (False)
- Explain why the bulb would not glow in the arrangement shown in Fig. 12.12
Ans. The bulb will not glow in this arrangement because the circuit is not complete as we see one wire from an electric cell is directly connected to the electric bulb while the other end of the wire is connected to the bulb through an insulator. So, the circuit in the given arrangement remains incomplete due to the insulator. Hence bulb will not glow.
- 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.
Ans. The drawing shown in the figure can be completed by joining one free end of the wire to the free end of the electric cell and joining other free ends of the wire to the electric bulb.
- What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.
Ans. An electric switch is a simple device used to make or break an electric circuit. Electric switches are used to turn on or turn off electrical appliances in our homes. The electrical gadgets which have electrical switches built into them are ovens, freezers, rice cookers, electric iron, patty makers, toasters etc.
- Would the bulb glow after completing the circuit shown in Fig. 12.13 if instead of a safety pin, we use an eraser?
Ans. No, the bulb will not glow if we use an eraser in place of a safety pin because an eraser is an insulator and does not conduct electricity.
- Would the bulb glow in the circuit shown in Fig. 12.14?
- 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.
Ans. As we have found that a bulb begins to glow using a conduction tester, which means electricity flows through the circuit. It clearly shows that the given object is a conductor because electricity cannot pass through insulators.
- Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.
Ans. An electrician should use rubber gloves while repairing an electric switch because rubber is an insulator and does not allow electricity to pass through it. So, it prevents the body of the electrician from electric shocks.
- The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?
Ans. The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber cover over them because rubber is an insulator and it cannot allow passage of electric current through it. Thus, it protects the body of the electrician from electric shocks.