In the open circuit test, the input voltage is the terminal voltage and is also the open circuit/ no load voltage and can be read using the voltmeter. The secondary side of the transformer is open circuited. The current I1 = 0 therefore Iin = Inl + I1 ....Iin = Inl. Using the ammeter one can obtain (open circuit current) Ioc = Inl. Using the wattmeter, you can find the open circuit power. A low power factor wattmeter is needed.
using the values obtained in the experiment,
Poc/(Voc x |Ioc|) = cos ɵ
Voc/|Ioc|cos ɵ = Ro
Voc/|Ioc|sin ɵ = jXm
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