Short circuit current distribution

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SUMMARY

The discussion centers on the behavior of current distribution in a circuit when a wire is added to create a short circuit. It is established that even with a short circuit, a small amount of current, measured in milliamps, can still flow through the load due to the inherent resistance of the wires used. The current distribution is determined by the series load, which shares current between the short circuit and the original load based on their respective resistances. It is confirmed that a perfect short circuit does not exist, as there will always be a voltage difference across the short, leading to residual current in the higher resistance path.

PREREQUISITES
  • Understanding of basic electrical circuit theory
  • Knowledge of Ohm's Law
  • Familiarity with series and parallel circuit configurations
  • Concept of resistance in electrical components
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  • Research the impact of wire resistance on circuit performance
  • Study the principles of current division in electrical circuits
  • Learn about the characteristics of short circuits and their implications
  • Explore methods for measuring residual current in circuits
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Electrical engineers, circuit designers, and students studying electronics who seek to understand current behavior in short circuit scenarios.

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Hi, After adding a wire across a circuit to section off part of the load in the form of a short circuit, I am still seeing a couple of milliamps flowing through the load. Is this due to the fact that the wires used to create the short circuit will have a small amount of resistance, hence preventing all the currrent flowing through the short circuit?
 
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Yes.

The remaining series load will determine the current. The current will be shared by the short and the shorted part of the load in proportion to the reciprocal of their respective resistances.

In reality there is no such thing as a perfect short circuit. There will be a voltage difference across the short. That will result in a residual current through the higher resistance original load path.
 

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