Learnabout Electronics

- Circuits and Resistors

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Module 4.4

Short Circuit Faults

What you´ll learn in Module 4.4
  • After studying this section, you should be able to:
  • Describe the effects of short circuit components in basic resistive circuits.
  • Diagnose short circuit component faults in resistive circuits using current and voltage measurements.

Short Circuits

If two points in a circuit are connected by some component or conductor having a resistance of zero (or practically zero) ohms, the two points are said to be SHORT CIRCUITED or that there is a short circuit present. Under these conditions a larger current will flow, due to the reduction in resistance, and there will be NO (or almost no) potential difference between the ends of the short circuit.

These conditions are illustrated below in Fig.4.4.1.

Voltage and current coditions in a working circuit example
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Fig. 4.4.1 Short Circuit Faults


Fig. 4.4.1 Short Circuit Faults

The opposite extreme fault condition to having an short circuit is having a component or components go "Open Circuit", which is dealt with Resistors & Circuits Module 4.3

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