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Is you'll need to short circuit between the drain and the source to identify FET test
Short circuit test and open circuit test are widely used to test the efficiency of the transformer.
You can test for voltage in a circuit with the help of voltmeter or multimeter (analog or digital (DMM) ). Vikas Pratap Singh NIT Kurukshetra vps3361@gmail.com
An open-circuit test is done with the transformer running at its rated voltage but with no load. This measures the power lost in the magnetic core. (IR Losses) A short-circuit test is done with the transformer running at its full rated current in all windings but at a low voltage. The secondary is shorted and the primary voltage is adjusted to give the rated current. This measures the power lost in the copper windings. (Copper losses)
The general answer is that a continuity tester is used to check for an open circuit.