6th Science NCERT Chapter 12
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Important topics from the chapter "Electricity and Circuits":
1. Electric Cell
– An electric cell is a device that provides electricity to various gadgets by converting stored chemical energy into electrical energy. It consists of positive and negative terminals that work together to produce electricity.
2. Circuit Connection with Bulb
– Connecting an electric bulb to an electric cell in different ways to understand how the bulb glows when placed within an electric circuit. The circuit provides a complete path for current flow.
3. Electric Circuit
– Understanding the concept of an electric circuit, where the path is completed for electric current to flow between the positive and negative terminals of an electric cell. The bulb only lights up when the circuit is complete and current can flow through it.
4. Caution and Safety Measures
– Learning about the dangers of mishandling electricity and electric devices, the importance of caution while dealing with electrical components, and the risk associated with experimenting with electric wires and sockets without proper knowledge.
5. Troubleshooting Bulb Issues
– Recognizing reasons why an electric bulb may not glow, such as a break in the filament causing a disruption in the current flow between the cell terminals. Understanding how to identify and rectify issues with the bulb to ensure proper functioning.
6. Practical Application – Making a Torch
– Engaging in activities to practically apply knowledge by making a torch using a torch bulb, wire, and an electric cell. Learning how to connect the components to create a functioning torch that demonstrates the use of an electric circuit.
These topics cover the essential concepts related to electricity and circuits, providing a comprehensive understanding for students studying this chapter.
What are some purposes for which electricity is used according to the chapter?
Electricity is used for lighting homes, roads, offices, markets, and factories, operating pumps, and in devices like torches, alarm clocks, wristwatches, transistor radios, and cameras.
What are the positive and negative terminals of an electric cell, and how do they relate to the flow of electricity?
An electric cell has a metal cap as the positive terminal and a metal disc as the negative terminal. The positive terminal is marked with a positive (+) sign and the negative terminal with a negative (–) sign. The positive terminal is where current flows out of the cell, while the negative terminal is where it returns.
Explain the importance of the filament in an electric bulb.
The filament is the thin wire inside the glass case of an electric bulb that gives off light when electricity passes through it. It is the part that actually emits light in the bulb.
What is an electric circuit, and why is it necessary for a bulb to glow?
An electric circuit is a complete path for electricity to pass through. It is necessary for a bulb to glow because the current needs a path to flow from the positive to the negative terminal of the electric cell, passing through the filament of the bulb, which makes it light up.
Why might an electric bulb not glow even when connected to an electric cell?
An electric bulb may not glow if it has fused due to a break in its filament. If the filament is broken, the path for the current between the terminals of the electric cell is interrupted, preventing the bulb from lighting up.
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