Class 7 Science - BIHAR
Electricity: Circuits and their Components
In this chapter, Class 7 Bihar Board students will learn about the fundamentals of electricity by exploring electric circuits and their components. The chapter covers the symbols of electric components like cells, switches, bulbs, and wires, and explains the difference between open and closed circuits. Students will also discover the heating and magnetic effects of electric current through practical examples like electric fuses and electromagnets. This is a crucial chapter for board exams as it builds the foundational concepts of physics, frequently appearing in both objective and short-answer questions to test practical understanding.
Start Learning FreeKey Concepts
Electric Circuit
A continuous closed path along which an electric current can flow from one terminal of the electric cell to the other.
Components and Symbols
Standardized symbols used to represent electrical parts like cells, switches, wires, and bulbs in circuit diagrams for easy reading.
Heating Effect of Electric Current
When an electric current passes through a wire, the wire gets hot due to the conversion of electrical energy into heat energy.
Electric Fuse
A safety device used in electrical circuits that melts and breaks the circuit when excessive current flows, preventing damage and fires.
Electromagnet
A magnet created by passing an electric current through a coil of insulated wire wrapped around an iron core.
Important Formulas
Board Exam Info
In the Bihar Board Class 7 Science examinations, this chapter typically carries around 6 to 8 marks. Questions usually include drawing circuit diagrams using standard symbols, differentiating between open and closed circuits, and explaining practical applications like the heating effect or electric fuses.
Frequently Asked Questions
Why does a bulb fuse?
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 an open switch, which stops the flow of current.
Why should we not touch switches with wet hands?
Water is a good conductor of electricity. Wet hands can provide a low-resistance path for electric current, leading to a severe electric shock.
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