Class 7 Science - ODISHA
Electricity: Circuits and their Components
In this chapter, Class 7 students of the Odisha Board (BSE) will explore the fascinating world of electricity. You will learn how electric currents flow, what makes up a simple electric circuit, and the functions of various components like cells, switches, bulbs, and connecting wires. The chapter also introduces the heating and magnetic effects of electric current through fun, practical examples like electromagnets and safety fuses. Understanding these concepts is crucial for scoring well in your BSE board exams and forms the foundational base for higher physics chapters.
Start Learning FreeKey Concepts
Electric Circuit
A complete, closed path along which electric current flows from one terminal of an electric cell to the other.
Electric Cell
A source of electricity that has two terminals: a positive terminal and a negative terminal, converting chemical energy into electrical energy.
Switch (Key)
A simple device used to break or complete an electric circuit, controlling the flow of current in a device.
Heating Effect of Electric Current
The production of heat in a resistor or wire when an electric current passes through it, used in appliances like irons and heaters.
Electromagnet
A magnet created by passing an electric current through a coil of insulated wire wound around an iron core.
Important Formulas
Board Exam Info
In the Odisha (BSE) Class 7 Science examinations, this chapter typically carries around 6 to 8 marks. Questions usually include diagram-based questions (drawing an electric circuit), short answer questions differentiating between open and closed circuits, and applications of the heating and magnetic effects of electric current.
Frequently Asked Questions
What is the difference between an open circuit and a closed circuit?
A closed circuit is complete and allows electricity to flow, making the bulb glow. An open circuit has a break or gap (like an open switch) so electricity cannot flow.
Why does a bulb get hot when it glows?
When electric current passes through the thin filament of the bulb, it offers resistance which produces a large amount of heat, causing it to glow.
Can we use a plastic wire to make an electric circuit?
No, plastic is an insulator and does not conduct electricity. We must use conducting wires made of metal like copper.
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