Electricity | Class 7 Science Notes
By ConceptScroll Team · Published on 17 July 2026 · 2 min read
Electricity – this guide gives you a concise, exam-ready overview of Electricity from Class 7 Science, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
Science and Society
This section highlights the significance of electric cells and batteries in making electrical devices portable and convenient. It discusses the variety of cells and batteries available in different shapes and sizes tailored for specific uses. Cylindrical batteries are commonly used in torchlights, clocks, remotes, and toys. Button cells power watches and hearing aids. Rechargeable batteries are essential for mobile phones, laptops, and electric vehicles, reflecting technological advancement and societal reliance on portable electrical energy sources. The section underscores how these compact energy sources have transformed the usability of electrical devices, contributing to modern lifestyles and technological progress.
📊 Diagram: Images show various types of batteries including cylindrical cells, button cells, and rechargeable batteries used in different devices.
🧪 Activity: Students are encouraged to visit electrical shops to identify different types of cells and their applications.
🔗 Connection: This section connects the scientific concepts of electricity to their societal applications and technological advancements.
Frequently asked questions
Choose the incorrect statement. (i) A switch is the source of electric current in a circuit. (ii) A switch helps to complete or break the circuit. (iii) A switch helps us to use electricity as per our requirement. (iv) When the switch is in 'OFF' position, there is an air gap between its terminals.
The incorrect statement is (i) A switch is the source of electric current in a circuit. Explanation: The source of electric current is an electric cell or battery, not the switch. The switch only helps to complete or break the circuit to control the flow of current.
Observe Fig. 3.16. With which material connected between the ends A and B, the lamp will not glow?
The lamp will not glow if an insulator is connected between ends A and B. Explanation: An insulator does not allow electric current to pass through it, so the circuit will remain incomplete and the lamp will not glow.
In Fig. 3.17, if the filament of one of the lamps is broken, will the other glow? Justify your answer.
No, the other lamp will not glow. Explanation: In the given figure, the lamps are connected in series. If the filament of one lamp is broken, the circuit becomes open and current cannot flow through the circuit. Hence, the other lamp will not glow.
A student forgot to remove the insulator covering from the connecting wires while making a circuit. If the lamp and the cell are working properly, will the lamp glow?
No, the lamp will not glow. Explanation: The insulator covering on the wires prevents the flow of electric current. Since the wires are insulated, the circuit will not be complete and current will not flow to the lamp.
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