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Firstly turn of the power before this test...
Using a resistance or continuity tester you should get the following results:

Short circuit: Very low resistance (nearly 0 ohms) or the bell will ring.
Open circuit: Very high resistance (Somewhere in the range of Mega ohms) or the bell will not ring.

The reason for this is because and open circuit has a gap in it (which has high resistance).
The short circuit has wires that are crossed and so has a really low resistance.

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10y ago
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14y ago

Open circuit , break in cable , continuity Short Circuit , fault between live and earth or neutral , Check with continuity meter and locate

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12y ago

open circuit has infinite resistance

short circuit has no resistance at all

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Q: What are the approximations of open circuit and short circuit tests?
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