10. Electric Current and its Effects Class 7 Science NCERT Notes for Chapter 10 CBSE
Welcome to Electric Current and its Effects Class 7 Science NCERT Notes for Chapter 10 CBSE.
Electric Current and Its Effects – Class 7 Exam Notes
In this set of comprehensive exam notes for Class 7, we will delve into the intriguing world of “Electric Current and Its Effects.” These notes are meticulously structured with headings, subheadings, and a pointwise format for your easy comprehension. To enhance your understanding, we’ve included Wikipedia links for certain terms and provided keywords along with their definitions. Additionally, you can find a list of FAQs with detailed answers at the end.
Introduction
Purpose of Electric Circuits
- Electric circuits are fundamental to modern technology and everyday life.
- They provide the path for electric current to flow, powering various devices and appliances.
Symbols of Electric Components
Representing Electric Components
- Electric components are represented by symbols in circuit diagrams.
- These symbols simplify the visual representation of complex circuits.
Examples of Symbols
- Electric cell: Symbolized by a longer line (positive terminal) and a shorter, thicker line (negative terminal).
- Switch: Symbols depict ‘ON’ and ‘OFF’ positions.
- Battery: Symbol signifies a battery.
Importance of Symbols
- Consistency in using symbols is crucial for clear communication and understanding of electrical circuits.
Heating Effect of Electric Current
Heating Effect
- The heating effect of electric current refers to the generation of heat when electric current flows through a conductor.
Applications
- This phenomenon is harnessed in heating elements found in appliances like heaters and stoves.
- The choice of conductor material, length, and thickness is tailored to specific heating requirements.
Magnetic Effect of Electric Current
Magnetic Effect
- When an electric current flows through a conductor, it creates a magnetic field around the conductor.
- This effect is known as the magnetic effect of electric current.
Oersted’s Experiment
- Hans Christian Oersted’s groundbreaking experiment demonstrated that a compass needle near a current-carrying wire deflects due to the magnetic effect.
Electromagnets
Creating Electromagnets
- Electromagnets are coils of insulated wire wrapped around an iron core.
- They exhibit magnetic properties when electric current flows through the coil.
Applications
- Electromagnets find applications in various devices, such as cranes, electric bells, and junkyard machines for separating magnetic materials.
Electric Bell
Functionality
- An electric bell consists of an electromagnet and an iron strip with a hammer.
- When the circuit is closed, the electromagnet attracts the iron strip, causing the bell to ring.
Safety Measures
Fuses and MCBs
- Fuses and Miniature Circuit Breakers (MCBs) are safety devices used to prevent overcurrent and short circuits.
- They play a vital role in safeguarding electrical circuits and devices from damage.
Keywords and Definitions
- Electric cell: A device that produces electricity through chemical reactions, with a positive and negative terminal.
- Switch: An electrical component used to control the flow of current in a circuit.
- Battery: A combination of two or more cells connected to provide a power source.
- Heating effect: The phenomenon where electric current passing through a conductor generates heat.
- Magnetic effect: The creation of a magnetic field around a conductor when an electric current flows through it.
- Electromagnet: A coil of wire wrapped around an iron core that exhibits magnetic properties when an electric current flows through it.
- Circuit diagram: A graphical representation of an electrical circuit using symbols and lines.
Conclusion
Electric current and its effects play a pivotal role in our modern world. Understanding the heating and magnetic effects, as well as the application of electromagnets, is essential in various technological advancements. Additionally, safety measures like fuses and MCBs ensure the protection of electrical circuits and devices.
Frequently Asked Questions (FAQs)
What is the heating effect of electric current?
The heating effect of electric current refers to the generation of heat when an electric current passes through a conductor.
How are electric components represented in circuits?
Electric components are represented by symbols in circuit diagrams, simplifying their visual representation.
What is the magnetic effect of electric current?
The magnetic effect of electric current is the phenomenon where a wire carrying electric current behaves like a magnet.
What are electromagnets used for?
Electromagnets find applications in various devices, such as cranes, electric bells, and junkyard machines for separating magnetic materials.
How do fuses and MCBs enhance electrical safety?
Fuses and Miniature Circuit Breakers (MCBs) protect electrical circuits by preventing overcurrent and short circuits.
What are the key components in an electric bell?
An electric bell comprises an electromagnet and an iron strip with a hammer.
What is the purpose of symbols in circuit diagrams?
Symbols in circuit diagrams simplify the representation of complex circuits, aiding in visual understanding.
Who discovered the magnetic effect of electric current?
Hans Christian Oersted is credited with discovering the magnetic effect of electric current.
Why is consistency in using symbols important in circuit diagrams?
Consistency ensures clear communication and understanding of electrical circuits among professionals and enthusiasts.
Where can I find safety devices like fuses and MCBs in electrical circuits?
Fuses and MCBs are installed in electrical circuits to prevent overloads and short circuits, enhancing safety.
These exam notes provide a comprehensive overview of “Electric Current and Its Effects,” helping you prepare effectively for your Class 7 exams.
This was the end of Electric Current and its Effects Class 7 Science NCERT Notes for Chapter 10 CBSE.
For more information, refer to NCERT SOLUTIONS, NCERT NOTES, and NCERT BOOKS .
