Question
Download Solution PDFA fuse in an electrical circuit 'blows' as a result of a high:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Fuse:
- A fuse is a protective device.
- It is the weakest portion of the electrical circuit.
- An electric current heats the wire when the current passes through it.
- The amount of heat depends upon the current and resistance in the wire.
- In automobiles, this heating effect is utilized in heaters, bulbs, gauges, etc.
- The heating effect in the circuit is limited by the fuse.
- If this limit is not controlled, the circuit of accessories will be overloaded causing severe damage to them.
- A fuse opens the circuit by blowing out when the current (overload) flows in the circuit to prevent severe damage to the accessories.
- The flow of excess current in a circuit may be caused by a short circuit.
- A fuse in an electrical circuit 'blows' as a result of a high current flow caused by a short circuit.
- Fuse elements are of lead-tin or tin-copper alloy wire in strips of correct amperage for each circuit.
- The fuse is assembled in a fuse carrier of glass or ceramic material.
- Nowadays fuse elements assembled in glass tubes, called cartridges, are widely used in automobiles.
- It consists of a glass tube (1) with metal end caps (2) & (4).
- A soft fine wire or strip (3) carries the current from one cap to another (4).
- The conductor (3) is designed to carry a specific maximum current.
Short circuit:
- A short circuit will occur when two terminals of the same circuit touch each other.
- A short circuit may also occur if the insulation between the two cores of the cable is defective.
- This results in a lower resistance. This causes a large current to flow which can become a hazard.
Last updated on Jun 11, 2025
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