OPEN CIRCUIT: Is any break in the current path that is undesired, such as a broken wire or component, or designed such as open switch contacts in a lighting circuit.

SHORT CIRCUIT: It is an undesired very low resistance path across two points in a circuit. It may be across one component, several component, several components, or across the entire circuit. There can be designed shorts in circuits, such as purposeful dumpers or close switch.

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