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Primary voltage is the voltage applied to the terminals of the primary winding of a transformer. The energy applied to the primary must be in the form of a changing voltage which creates a constantly changing current in the primary, since only a changing magnetic field will produce a current in the secondary.
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primary voltage = power /primarycurrent
=150/3
50V
b)Es/Ep=Ip/Is
300/50=3/Is
Is=0.5A
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