NCERT Class 6 Science Chapter 9 Notes contain all important concepts of electricity and circuits. To begin with, our subject experts have simplified the meaning of electric current, electric cell, electricity, and electric circuit. Also, these notes are designed to help students ace their understanding of the materials around them, which serve as good and bad conductors of electricity. Furthermore, we have also provided NCERT solutions for questions included in the chapter “Electricity and Circuits:”. Also, we hope that the simple language and pictures used in the blog will help you know the things around you. Keep learning!!
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Summary of NCERT Class 6 Science Chapter 9
CBSE Class 6 Science Chapter 9 helps us learn about electricity and circuits. The chapter deals with current and electric current, electricity, electric cells, and electric circuits. In this chapter, we also explore the workings of an electric bulb. In addition, we get an understanding of conductors and insulators that complete or break an electric circuit, respectively.
Let us now explore important concepts in NCERT Class 6 Science Chapter 9!
Current and Electric Current
The movement of particles in one direction is called current. For instance, water currents or air currents that create winds. Whereas, electric current is the flow of particles in an electric circuit that generate electricity.
Electricity refers to the flow of electric current through a medium such as a metal wire. It is a form of energy that can be generated through the following:
- Electric cells
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An electric cell is an internal generator of electricity produced by chemical processes. A new cell must be used in place of the old one when the chemicals inside the old one run out. Positive and negative terminals are present in every cell. Positive and negative terminals must be linked, and this polarity must be preserved, for current to flow.
Here is how an electric cell produces electricity:
- A small amount of power is generated by an electric cell from the chemicals that are contained within it. Electric cells stop producing energy when their chemical resources are depleted.
Any closed-loop path that is taken by an electric current is called an electric circuit. The current cam only passes through a circuit when it is closed. Whereas, when the path is broken or the witch is open, the circuit is open. An open circuit does not conduct electricity as the current cannot flow in an open circuit.
A device used to break or connect an electric circuit is called an electric switch. When the switch breaks the circuit, it is Off and when it connects the circuit, it is On.
In an electric circuit, a wire acts as a conducting channel down which current can travel.
Typically, it is constructed of a metal that is a good electrical conductor.
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How Does an Electric Bulb Work?
Here are the components of an electric bulb and its working:
- It comprises a tiny wire that illuminates as current flows across it. This wire is known as the filament.
- A closed path for the current to flow is provided by an electrical circuit. Wires link the terminals of the lightbulb to the electric cell.
- Occasionally, the bulb fails to glow because an overheated filament fused (broke).
Conductors and Insulators
- Conductor: Any material or object that enables electricity to flow through it is known as a conductor. For instance, metals such as copper, cobalt, and aluminum.
- Insulator: Any material or object that obstructs the flow of electric current is called an insulator. It is also called a bad conductor of electricity. For instance, plastic, wood, air, and rubber.
It is a simple device or tool to determine whether a substance is an insulator or conductor.
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Important Questions and Answers in NCERT Class 6 Science Chapter 9
In this section, we have provided NCERT solutions to questions in CBSE Class 6 Science Chapter 9.
Ques 1: Fill up the blanks
- A device used for breaking an electrical circuit is known as_________________.
- An electric cell has ________________ terminals.
Ques 2: Which of the following statements is True or False?
- Electric current can flow through metals.
- A jute string, instead of a metal wire, can be used to create an electric circuit.
- Electric current can pass through a thermo Col sheet.
Ques 3: Explain why the bulb will not glow in the following arrangement:
Ans: The bulb will not glow as the circuit is incomplete. The circuit has an insulator between the battery and the bulb, which does not allow the bulb to glow. To complete the circuit, we need an electric switch in between the two.
Ques 4: What is the purpose of using an electric switch? Name a few electrical gadgets that have in-built switches.
Ans: The electric switch is placed to complete or break a circuit. Some of the electrical gadgets that have in-built switches are microwave ovens, fans, TVs, electric cookers, and refrigerators.
Ques 5: Would the bulb glow in the below-mentioned circuit?
Ans: No. The bulb will not glow.
Ques 6: The “conduction tester” was used to test an object, and it was discovered that the bulb started to glow. Is that thing an insulator or a conductor? Explain.
Ans: The bulb glows due to the conductor.
Ques 7: Why should a repairman for an electrical switch at your house wear rubber gloves? Explain.
Ans: As rubber gloves are insulators, they do not conduct electricity. Therefore, a repairman should wear rubber gloves to avoid electric shocks.
Ques 8: 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
Ans: Handles of screwdrivers and pliers are made of plastic or rubber because these are insulators. Due to this, electricians will be protected from electric shocks.
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Ans: It is the flow of particles in an electric circuit that generates electricity.
Ans: The wire in the bulb that conducts electricity is known as a filament. It is usually made of Argon.
Ans: Electricity refers to the flow of electric current through a medium such as a metal wire.
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