Chapter 14 – Electric current and its effects

These NCERT Class 7 Science Chapter 14 notes explain the importance of electricity in daily life and how electric current flows through a circuit. The chapter introduces electric current, electric circuits, cells, batteries, and basic circuit symbols used in diagrams.

Electric Current and its Effects also explains the heating effect and magnetic effect of electric current with common examples like electric bulbs, heaters, fuses, and electric bells. This chapter builds a foundation for understanding electricity safely and effectively.

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1. Introduction: why electricity is important

•  Electricity is used in homes, schools, and industries.
•  It helps in lighting, heating, and running devices.
•  This chapter explains electric current, circuits, and their effects.
•  Electricity is the invisible power of modern life.

2. Electric current

•  Electric current is the flow of electric charges.
•  Current flows only when there is a complete circuit.

3. Electric circuit

•  An electric circuit is a closed path for current flow.
•  Main parts are electric cell, wires, switch, and bulb/device.
•  In an open circuit, current does not flow.
•  In a closed circuit, current flows properly.

4. Electric cell

•  An electric cell produces electricity from chemical energy.
•  It has a positive (+) and a negative (–) terminal.
•  A dry cell is commonly used in devices.

5. Battery

•  A battery is a group of cells connected together.
•  A battery provides more power than a single cell.

6. Circuit symbols

•  Cell is shown by a long and short line.
•  Battery is shown by many cells together.
•  Bulb is shown as a circle with filament.
•  Switch is shown by a break in the line.

7. Heating effect of electric current

•  When current passes through a wire, heat is produced.
•  This is called the heating effect of electric current.
•  Electric iron, heater, and bulb work on this effect.

8. Why bulb glows

•  A bulb has a thin filament.
•  The filament becomes very hot when current flows.
•  The hot filament emits light.

9. Electric fuse

•  An electric fuse is a safety device.
•  It protects appliances from excess current.
•  Fuse wire melts when current is too high.
•  The circuit breaks and current stops.

10. Causes of excess current

•  Short circuit causes sudden flow of high current.
•  Overloading happens when many devices use one socket.

11. Magnetic effect of electric current

•  Electric current produces a magnetic effect.
•  A current-carrying wire behaves like a magnet.

12. Electromagnet

•  An electromagnet is a temporary magnet made by electric current.
•  It loses magnetism when current stops.
•  It is used in electric bells and scrap yard cranes.

13. Electric bell

•  An electric bell works on the magnetic effect of current.
•  The electromagnet attracts the iron arm.
•  Continuous making and breaking of the circuit causes ringing.

14. Advantages of electromagnets

•  The strength of an electromagnet can be controlled.
•  It can be switched on and off easily.

15. Safety measures while using electricity

•  Do not touch switches with wet hands.
•  Use proper insulation for wires.
•  Do not overload sockets.

16. Important keywords with simple definitions

•  Electric current – flow of electric charges.
•  Circuit – closed path for current flow.
•  Battery – group of cells supplying power.
•  Heating effect – heat produced by electric current.
•  Fuse – safety device that stops excess current.
•  Electromagnet – temporary magnet made by current.

Understanding NCERT Class 7 Science Chapter 14 – Electric Current and its Effects is important to learn how electricity works and why safety devices are necessary. The chapter clearly explains heating and magnetic effects with practical applications.

These concepts are important for school examinations and foundation-level science preparation. Students should next read Chapter 15: Light to understand reflection, images, and properties of light.

FAQs

Q1. What is explained in NCERT Class 7 Science Chapter 14?
The chapter explains electric current, electric circuits, and effects of electric current.

Q2. What is an electric circuit?
An electric circuit is a closed path through which electric current flows.

Q3. What is the heating effect of electric current?
It is the production of heat when electric current passes through a wire.

Q4. What is an electric fuse?
An electric fuse is a safety device that prevents damage due to excess current.

Q5. Why is NCERT Class 7 Science Chapter 14 important for exams?
It explains basic electricity concepts and safety, which are frequently asked in school and foundation-level exams.

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