A fuse in an electrical circuit 'blows' as a result of a high:

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RRB ALP Mechanic Diesel 21 Jan 2019 Official Paper (Shift 1)
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  1. voltage caused by a short circuit
  2. current flow caused by an open circuit
  3. voltage caused by an open circuit
  4. current flow caused by a short circuit

Answer (Detailed Solution Below)

Option 4 : current flow caused by a short circuit
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Explanation:

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.
Purpose of fuse:
  • 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.
Construction:
  • 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.

F3 Vilas Engineering 9.1.2023 D10

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.
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