The diagram shows a plug which contains a fuse, an MCB and an RCD, all of which are used in domestic circuits - Leaving Cert Physics - Question c - 2010
Question c
The diagram shows a plug which contains a fuse, an MCB and an RCD, all of which are used in domestic circuits.
(i) Explain how a fuse works.
(ii) How does the fuse... show full transcript
Worked Solution & Example Answer:The diagram shows a plug which contains a fuse, an MCB and an RCD, all of which are used in domestic circuits - Leaving Cert Physics - Question c - 2010
Step 1
Explain how a fuse works.
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Answer
A fuse is a safety device that interrupts the flow of current when it exceeds a predetermined level. It contains a thin wire that melts when too much current flows through it, effectively breaking the circuit and preventing potential damage or fire hazards.
Step 2
How does the fuse improve safety?
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Answer
The fuse improves safety by preventing excessive current flow, which could lead to overheating and fire risks. By breaking the circuit when the current is too high, the fuse protects both the electrical system and the appliances connected to it.
Step 3
What is an MCB?
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An MCB, or miniature circuit breaker, is a device designed to automatically switch off electrical circuits in the event of overload or short circuit, ensuring protection against potential hazards.
Step 4
What is the function of an RCD?
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The function of an RCD, or residual current device, is to protect against electrocution by disconnecting the electrical supply if it detects an imbalance between the live and neutral currents. It quickly cuts off power to prevent injury.
Step 5
Why should an appliance be earthed?
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An appliance should be earthed to provide a safe pathway for electrical current in the event of a fault, thereby reducing the risk of electric shock. Earthing helps ensure that the current flows safely to the ground instead of through a person.
Step 6
Give one other precaution that should be taken to improve safety when using electricity in the home.
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One precaution is to avoid using appliances near water or damp areas, as this significantly increases the risk of electric shock. Additionally, it is important not to overload sockets to prevent overheating.
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