Exam Question
What is a short circuit and how may a short-circuit develop in
(a) a generator, and
(b) the external circuit, and what is the usual result in each case? How may the occurrence of short-circuit be minimized? (16)
Class 4 (4th Engineer)
MET
📅 Aug 2022
Reference Answer
### Definition of a Short Circuit
A short circuit is an abnormal connection of very low impedance between two points of different potential in an electrical circuit. As defined in the provided context, it is "an electrical circuit in a device of lower resistance than that of a normal circuit, especially one resulting from the unintended contact of components and consequent accidental diversion of thecurrent." Due to the extremely low resistance (R → 0) in the fault path, Ohm's Law ($$I = \frac{V}{R}$$) dictates that the resulting current will be exceptionally high, limited only by the total impedance of the power source and the conductors leading to the fault. This massive current flow is the primary cause of damage.
### (a) Short-Circuit Development and Results
#### 1. In a Generator (Internal Fault)
A short circuit is an abnormal connection of very low impedance between two points of different potential in an electrical circuit. As defined in the provided context, it is "an electrical circuit in a device of lower resistance than that of a normal circuit, especially one resulting from the unintended contact of components and consequent accidental diversion of thecurrent." Due to the extremely low resistance (R → 0) in the fault path, Ohm's Law ($$I = \frac{V}{R}$$) dictates that the resulting current will be exceptionally high, limited only by the total impedance of the power source and the conductors leading to the fault. This massive current flow is the primary cause of damage.
### (a) Short-Circuit Development and Results
#### 1. In a Generator (Internal Fault)
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