CBSE Class 7 Science Exemplar Chapter 14: Electric Current and Its Effects NCERT Solutions
CBSE Class 7 Science chapter Electric Current and Its Effects introduces students to the fascinating world of electricity. This chapter explores how electric current, when flowing through a wire, can create both heating and magnetic effects. You'll learn about the components of an electric circuit, such as switches, bulbs, and batteries, and how they work together. The solutions provided explain concepts like the magnetic field around a current-carrying wire, the heating effect that can be used in appliances, and the crucial role of safety devices like fuses in preventing damage from excessive current. Understanding these principles is key to grasping how everyday electrical devices function and ensuring electrical safety.
Quick info
| Board | CBSE |
|---|---|
| Class | Class 7 |
| Subject | Science Exemplar |
| Session | 2026 |
| Language | English |
| Type | NCERT Solutions |
| Chapter | Chapter 14 |
Chapter summary
Chapter 14 of the CBSE Class 7 Science Exemplar focuses on Electric Current and Its Effects. The NCERT Solutions cover key concepts such as the magnetic effect of current, the heating effect of current, and the function of electric fuses. The solutions aim to clarify how a current-carrying wire can influence a magnetic needle and how excessive current can lead to heating and potentially blow a fuse, ensuring circuit safety. This chapter's exercises are designed to reinforce understanding of these electrical phenomena.
Learning outcomes
- Understand that a current-carrying wire produces a magnetic field.
- Explain the magnetic effect of electric current.
- Describe the function and importance of an electric fuse.
- Analyze the behavior of bulbs in a circuit when connected in series.
- Identify the conditions under which an electric fuse operates.
Topics covered
Paper topics
- Electric Current
- Effects of Electric Current
- Magnetic Effect of Current
- Magnetic Field
- Deflection of Magnetic Needle
- Heating Effect of Current
- Electric Fuse
- Maximum Current Limit
- Series Circuits
- Simultaneous Glow of Bulbs
Important topics
- Magnetic Effect of Electric Current
- Electric Fuse Functionality
- Series Circuit Behavior
- Current Carrying Wire and Magnetism
PDF preview
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Questions and Solutions
Multiple Choice Questions - 1
Multiple Choice Questions - 2
Multiple Choice Questions - 3
Common mistakes
- Confusing the magnetic effect with the heating effect of current.
- Misunderstanding the role of a fuse and its current limit.
- Incorrectly predicting the order in which components in a series circuit will activate.
Revision tips
- Review the concept of electromagnetism and how current creates a magnetic field.
- Understand the safety mechanism of an electric fuse and its importance.
- Visualize the flow of current in series circuits to predict simultaneous activation.
- Practice the multiple-choice questions to reinforce understanding of basic principles.
Practice MCQs
Q1. When an electric current flows through a copper wire, what is a likely effect observed if a magnetic needle is placed nearby?
Explanation: A current-carrying wire generates a magnetic field around it, which can cause a nearby magnetic needle to deflect, demonstrating the magnetic effect of electric current.
Q2. Which statement is NOT correct regarding an electric fuse?
Explanation: Electric fuses are designed to protect circuits from excessive current. They operate based on a maximum safe current limit, not a minimum limit. If the current exceeds this maximum, the fuse blows.
Q3. In a series circuit with three bulbs (A, B, C) and a switch, if the switch is turned ON, when will the bulbs glow?
Explanation: In a series circuit, the electric current flows through all components simultaneously. Therefore, if the circuit is complete and the switch is ON, all connected bulbs will glow at the same time without any noticeable delay.
Frequently asked questions
What is the main concept covered in CBSE Class 7 Science Exemplar Chapter 14?
Chapter 14 focuses on the effects of electric current, specifically the magnetic effect (how current affects a magnetic needle) and the heating effect, along with the safety device known as an electric fuse.
How do these NCERT Solutions help students?
These solutions provide clear, rewritten explanations for each question, helping students understand the concepts of electric current and its effects, and how to solve related problems accurately for exam preparation.
What is the magnetic effect of electric current?
The magnetic effect of electric current refers to the phenomenon where an electric current flowing through a wire produces a magnetic field around it, capable of deflecting a magnetic needle.
Why is an electric fuse important in a circuit?
An electric fuse is a safety device that contains a wire designed to melt and break the circuit if the current exceeds a safe maximum limit, thus preventing damage to appliances and potential fires.
In a series circuit, do all components receive current at the same time?
Yes, in a series circuit, the electric current flows through all components sequentially and simultaneously. Therefore, if the circuit is complete, all components like bulbs will activate at the same time.
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