Describes the working of a simple circuti diagram and its components, electromagnetism and its effects and application
Introduction to CBSE Class 7 Science Chapter "Electric Current and Its Effects"
In the “Electric Current and Its Effects” chapter of CBSE Class 7 Science, students learn about electric current as a flow of electric charge and its various applications. The chapter starts with the concept of an electric circuit, explaining components such as cells, wires, bulbs, and switches. It introduces the effects of electric current including heating, magnetic effect, and chemical effect, which form the basis for many appliances and industrial processes.
The chapter further delves into the practical applications of these effects, such as in the functioning of electric bulbs, fuses, electric iron, heaters, and electromagnets. It discusses the construction and working of a simple electric circuit and explains the purpose and function of a fuse in protecting circuits. The topic of electromagnets is expanded upon, illustrating how current can turn a piece of iron into a magnet.
Safety measures with electricity and the concept of the earth wire, overloading, and short-circuiting are crucial aspects that are covered. The significance of using an MCB (Miniature Circuit Breaker) is also discussed, which is important for students to understand the need for safe practices when dealing with electricity.
Assignments for CBSE Class 7 Science Chapter “Electric Current and Its Effects”
- Circuit Building: Construct a simple circuit using a cell, wires, and a bulb, and demonstrate how a switch operates within this circuit.
- Investigating Heating Effects: Experiment with a circuit to show how the electric current can heat a wire, using safe, low-voltage batteries.
- Design an Electromagnet: Create an electromagnet using a battery, nail, and copper wire, and test its strength with paper clips.
- Safety Poster: Design a safety poster outlining the dos and don’ts when dealing with electric appliances and circuits.
- MCB Research: Research how an MCB works and why it is a safer option compared to traditional fuses.
Conclusion The chapter “Electric Current and Its Effects” is a blend of theoretical concepts and their practical implications, making it a vital part of the CBSE Class 7 Science curriculum. It lays the foundation for understanding how electric current shapes our daily life and stresses the importance of safety when using electrical devices.
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Questions and Answers for CBSE Class 7 Science Chapter "Electric Current and Its Effects"
- Q1: What is electric current? ANS: Electric current is the flow of electric charge through a conductor.
- Q2: What are the effects of electric current? ANS: The effects of electric current include the heating effect, magnetic effect, and chemical effect.
- Q3: How does an electric fuse work? ANS: An electric fuse works by melting and breaking the circuit when the current exceeds a certain limit, preventing potential damage to appliances and risks of fire.
- Q4: What is an electromagnet and how is it made? ANS: An electromagnet is made by winding a coil of wire around a piece of iron and passing an electric current through the coil, which magnetizes the iron temporarily.
- Q5: Why is the magnetic effect of electric current useful?
ANS: The magnetic effect of electric current is useful for creating electromagnets which are utilized in various devices like electric bells, loudspeakers, and motors. - Q6: What safety measures should one take when dealing with electric circuits?
ANS: One should always use insulated wires, never touch appliances with wet hands, ensure proper earthing, and use safety devices like fuses and MCBs. - Q7: Why is a fuse important in an electric circuit?
ANS: A fuse is important because it acts as a safety device that prevents electrical appliances from damage due to excessive current by breaking the circuit. - Q8: What is the difference between overloading and short-circuiting?
ANS: Overloading occurs when too many appliances draw power from the same source, causing excess current flow. Short-circuiting happens when wires with opposing currents come into contact, causing a sudden surge in current flow. - Q9: What is the principle behind the working of an MCB?
ANS: An MCB operates on the principle that it automatically switches off the electrical circuit during abnormal conditions of the network like overload and short circuit conditions. - Q10: Can you explain what a simple electric circuit is?
ANS: A simple electric circuit is a closed loop that allows current to flow from one terminal of a power source, through
