NCERT Solution for Class 10 Science Chapter 13
Magnetic Effects of Electric Current
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-238
Questions No-1
Name two safety measures commonly used in electric circuits and appliances.
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Two safety measures are: „« Use of earth wire and proper earthing. „« Use of fuse (now a days fuse wire is replaced by MCB).
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Two safety measures commonly used in electric circuits and appliances are as follows:
i. Electric fuse. It prevents the flow of excessive current through the circuit. When the current passing through the wire exceeds the maximum limit of the fuse element, the fuse melts to stop the flow of current through that circuit, hence protecting the appliances connected to the circuit.
ii. Earthing is a must to prevent electric shocks. Any leakage of current in an electric appliance is transferred to the ground and people using the appliance do not get the shock.
Earth wire and electric fuse
1. Fuses and Circuit Breakers:
» Fuses and circuit breakers are designed to protect electrical circuits from overcurrents. They automatically disconnect the circuit if there is a current overload, preventing damage to the wiring and appliances and reducing the risk of fire.
» Fuses contain a thin wire that melts when the current exceeds a certain limit, breaking the circuit.
» Circuit breakers use an electromagnet or bimetallic strip to open the circuit when excessive current flows through it.
2. Grounding:
» Grounding is a safety measure that involves connecting electrical devices and appliances to the ground or earth. It provides a low-resistance path for electric current to flow to the ground in the event of a fault, such as a short circuit.
» Grounding helps prevent electric shock by directing the current away from the user and reducing the risk of electric fires.
These safety measures are essential to protect both people and property from the potential hazards associated with electrical circuits and appliances.