Physics
Assertion (A) : A fuse is used in an electrical appliance to safeguard from electric shocks.
Reason (R) : A fuse melts and breaks the circuit when excessive current flows through it.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Static Electricity
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Answer
Both A and R are true and R is the correct explanation of A
Explanation
A fuse is a short length of wire made from a material with a low melting point. It is inserted in the live wire of a circuit so that, if the current exceeds a predetermined value because of over-loading or short-circuit, the fuse wire heats up and melts. This creates an open gap in the circuit, immediately stopping the current and thereby protecting the connected appliance and wiring from damage or fire. Because its action (melting and opening the circuit) is precisely what protects the appliance from excessive current, the Reason correctly explains the Assertion.
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Reason (R) : MCB can be reset (raised up) after tripping whereas fuse must be neglected once blown.
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Reason (R) : Lightning occurs due to the accumulation of same charges in clouds and earth's surface.
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