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Nov7-12, 06:03 AM
P: 661
It's because, in the normal way one uses a transformer, H decreases as increases, to keep B constant.

The point is that the primary winding sees B and the flux just as the secondary does. In a good transformer, the primary voltage makes the flux, with very little losses, and the secondary sees the same flux - except that they multiply it by their own numbers of turns.

Now if you have a very bad transformer which is inefficient at producing B and loses most primary voltage in the resistance of its copper windings, then H would be more constant than B, and would increase B and the secondary voltage.