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There are more than one thing going on here, So note the sequence.
1) When ANY Current is supplied to a transformer, the current in the primary coil produces a magnetic field.
2) If ANY coil of wire "Sees" a changing magnetic field, it will produce current in the wires of that coil.
3) Now comes the magic. If the current in the primary coil is changing all the time, the magnetic field produced by it will always be changing and therefore, the secondary coil will always 'see/sense' a changing magnetic field, it will produce a current in its wires directly caused by that changing magnetic field.
4) Now for the word 'Transformer'. If the number of coils in the secondary coil is more than the number of coils in the primary coil, the voltage produced in the secondary coil will be more than the voltage in the primary. In that way the voltage is 'Transformed' to a different value. Hence the name of this device is 'Transformer'
CommentA changing magnetic field does not 'produce current' in the wires of a coil. It produces voltage, NOT current! Current will only appear when the coil is connected to a load!
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∙ 11y ago
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