NCERT Solutions for Class 6 Science Chapter 12
NCERT Solutions for Class 6 Science Chapter 12 - Electricity and Circuits
The chapter helps the students with a very crucial understanding of the concepts of electricity and circuits. The section explains to the student various aspects of the electricity and properties of the circuits. Through this chapter, the student learns from where and how the electricity comes from. As electricity is an essential part of our everyday life, and everything necessary is somehow connected to electricity that it becomes of prime importance to make the students thoroughly understand its concepts. The chapter covers the following topics:
A bulb connected to an electric cell
An electric circuit
Electric Conductors and Insulators
The chapter starts with various relevant examples where electricity is needed and further encourages the students to think of some examples themselves. It moves on to give more relevant examples of the use of electricity in our everyday life and even our lives at night. This section helps the students understand what provides electricity and what is a power station.
It then informs the students about various situations when the supply of electricity may not be available or simply fail. The students learn in such a scenario of power failure what product can be used to provide light in these times of emergency. And how does it derive it manages to power.
This segment of the chapter helps the student understand how does a torch function and how to do the electricity travel to the bulb. The section moves on to teach students about electric cells. The students learn about various examples of objects which use electric cells. The students further learn about the structure of an electric cell and how does it look like. The students get to learn which side of an electric cell is a metal cap and which side of the electric cell is a metal disc. Once the students learn to identify these, then the student further learns about which is the positive terminal of the cell and which is the negative terminal of the cell. Using this knowledge, the student also learns how many terminals does an electric cell has.
The chapter then goes ahead to teach students more about the electric cells. The student learns how exactly the electric cell manages to produce electricity. The student learns how chemicals are stored in the cell help in the production of electricity. Once that is clear, the student gets to know the reason why an electric cell stops and why does the electric cell has to be replaced by a new one.
The students learn why there are danger signs posted on specific poles or electric substations or many such places. It makes the student understand what kind of serious injuries can happen in case the electricity is not handled correctly and what circumstances can even lead to death. The students learn why they should never experiment with wires and sockets of electricity, especially when they are not trained to do so. The students are then informed why the electricity of portable generators are also dangerous, and the reasons why is it only preferred to use electric cells.
For the students to have a more precise understanding, the chapter suggests and activity. Through this activity, the students will learn about the various parts of a light bulb and how does it function in an overview. The students learn about which part of the bulb is called a filament. The students further learn how the filament is placed inside the bulb and how it is fixed. The students then learn about how the various structures on which the filament is fixed, how does it extend to multiple areas of the bulb. Through this process, the student gets an idea about what are the two terminals of the bulb and how they are fixed, whether or not they are in touch with each other.
The students further learn why they should never connect both the terminals directly and through what process the terminal should be connected. The students learn the reasons why the cell may stop working, and due to what causes the chemicals present in the cell can get used up quickly.
A bulb connected to an electric cell
This section of the chapter helps the students to understand if they can make an electric bulb out of an electric cell.
The chapter helps the student understand better through a series of activities. The student is asked to take four lengths of electrical wires. The students learn how to expose the wire to perform this experiment. This activity tells the students where exactly does he need to place the exposed part on the cell and where does he need to place the exposed section on the bulb. The student comes to know what kind of tape he can use while performing this activity, and if the apes are not available, then what other alternatives can be used.
The students learn which wires are to be connected and in how many ways for the benefit of the activity. Through the observation of how the bulb reacts to each arrangement, the student learns through what arrangement of the wires will the bulb be able to low and what arrangements of wiring may not work.
An electric circuit
This segment of the chapter starts with reminding the students what they had learned previously so that the students can revise the concepts. First, the section tells the students what happened when they connected one terminal of electric cell to other terminals by using wires passing to and from the bulb. Then using this concept, the segment reminds the student of what happens when instead of one, two terminals of the electric cells are connected to the bulbs through two-terminal. The student learns what such an arrangement is called. The student then gets to know about the concept of an electric circuit.
The students will learn from this segment how an electrical circuit provides the path and how does it help in passing the electricity between the terminals of the electric cell. The student learns the exact condition required for the bulb to glow and understand the reasons for what happens to the bulb if the current does not flow through it.
The students learn about the direction of the flow of the current in an electric cell. They also learn what are the conditions due to which the current passes along the filament of the bulb. Through a careful study of this chapter, the student will understand the reason behind the glow of the bulb.
The students also learn about the times when the bulb doesn’t glow. The students understand the reasons behind not burning the bulb in spite of it being connected to the electric cell. The chapter explains to the students the concept of the fused bulb. The student learns what is meant by a fused bulb and the condition of the filament, which is inside of the bulb.
The segments explore multiple reasons behind the bulb getting fused. The student learns how filaments and its condition may lead to fused bulbs and what happens if the filament breaks down. The segment further makes the student understand in-depth what happens if the filament is broken and how it influences the flow of current. It is only after this information the student has an absolute understanding of why a fused bulb does not light up and why no current manages to pass through it.
Chapter Class 6 electricity and circuits teach about electric switches and how they function. This section helps the student to understand the concepts of an electrical switch through various activities. The students learn about the concepts of simple switches and more complex switches, which are also easy to put to use.
Through the activity, the students learn how they can make a switch by using as simple products such as drawing pins and other things such as safety pin, wires, and a small piece of wood or Thermo coal. The students learn about the apparatus through which they can use these materials to create switches. The activity further teaches the students how to make a circuit once the switches have been made. Then the students learn how to use this entire apparatus to make the bulb glow.
The students get to know what position of the safety pin will turn on the switch and how does the material influences the current to pass through to complete the circuit and how this helps the bulb to glow. The students also learn whether the bulb glowed or did not glow when the help of the safety pin was not used to complete the circuit and what is meant by the switch is off.
The students learn about the meaning of switches and the properties of it. The student also learns of how, despite being an elementary device, it can very well complete the circuit or even break it.
Electric Conductors and Insulators
This part of the chapter points out to the students about what was the nature of materials which was used in the previous activities. The students learn what happens if the materials are changed, which are different in life, such as how a cotton thread is separate from metal wire. After these activities, the students learn about what materials are used to make electric circuits, which enables the passing of current.
The chapter moves on to vital activity to test other situations under which the bulb lights up, or it doesn’t. The students also get to know what arrangement can be used by them to test whether a given material can allow the successful passing of the current or it doesn’t.
The students are encouraged to collect samples of a variety of materials and test how the flow of current passes through these samples and can the bulb glow.
Through these samples, this segment of the chapter makes the student understand what materials allow the passing of electric current and what materials do not let so. The student learns what is exactly meant by the phrase conductor of electricity.
After the student learns about the concepts of a conductor, the chapter moves on to teach the students about the idea of insulators. The students learn various properties of the insulation. The students also get to understand why does it not let the electric current pass.
The student utilizes these learnings to understand which materials can be used to best conduct electricity and which elements will prove to be unhelpful because of them being lousy conductor, or them being insulators in nature, of electricity. The chapter carries on to explain to the students about the quality of the air. After reading the chapter, the student can conclude whether the component air can be used as a good conductor and what are the reasons why it is regarded as an insulator.
The student further learns about the importance of both conductors and insulators. This part of the chapter makes the student understand how to sing materials having both the qualities help in utilizing them together and not get an electrical shock. The student also learns whether the human body is a good conductor of electricity or a bad conductor and what precautions should be used while handling an electrical device.
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