What are the approximations of open circuit and short circuit tests?
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.