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Electricity - circuits and their components

Learning Objectives

Identify and describe the components of an electrical circuit.
Explain the function of a switch in a circuit.
Differentiate between conductors and insulators.
Illustrate circuit diagrams using standard symbols.
Conduct experiments to identify working cells in a circuit.
Analyze the effects of circuit configurations on lamp functionality.
Discuss the importance of safety when handling electrical devices.

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Revision Notes & Summary

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Electricity: Circuits and their Components

Overview

Nihal and his classmates prepared a presentation on the uses of electricity, organizing their findings under different headings.

Uses of Electricity

Cooking: Electric kettle, mixer, grinder, toaster, oven, microwave, immersion rod, geyser.
Lighting: Homes, offices, streets, markets, factories, lift, escalator, refrigerator, air conditioner.
Transportation: Train, bus, car, scooter.
Entertainment: Television, radio.
Communication: Mobile phone, Internet.
Others: Water pump, crane, computer.

Entertainment	Communication	Others
Television, radio	Mobile phone, Internet	Water pump, crane, computer

Circuit Components

Basic Circuit Diagram

Battery: Cylindrical shape with positive (+) and negative (-) terminals.
Light Bulb: Positioned at the top, mounted on a base with connection points.
Wiring: Includes green, yellow, black, and red wires connecting the battery to the light bulb.

Electrical Components and Symbols

S.No.	Electrical component	Symbol
1.	Electric cell
2.	Battery	+ +
3.	Electric lamp
4.	Light Emitting Diode (LED)
5.	Switch in 'ON' position
6.	Switch in 'OFF' position	not
7.	Wire

Conductors and Insulators

Conductors: Materials that allow electric current to pass through easily (e.g., metals like copper, silver, gold).
Insulators: Materials that do not allow electric current to pass (e.g., rubber, plastic, glass).

Activity: Identifying Conductors and Insulators

Connect an electric cell and a lamp with free ends of wires.
Touch the free ends to various materials to see if the lamp glows.
Record observations in a table to classify materials as conductors or insulators.

S.No.	Object	Material it is made up of	Lamp glows (Yes/No)
1.	Stick	Wood	No
2.	Scale	Plastic
3.	Bangle	Glass
4.	Paper strip	Paper
5.	Candle	Wax
6.	Key	Metal
7.	Eraser	Rubber

Circuit Functionality

If the filament of a lamp is broken, the other lamp in the circuit will not glow.
If an insulator covers connecting wires, the lamp will not glow even if the cell is working.

Troubleshooting Circuits

If a lamp does not glow, possible reasons include broken connections, faulty components, or incorrect wiring.

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Practice Test – MCQs, True/False

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