Tutorial 10 - Extension

Proof

We know that for an ideal transformer, the voltage is related by:

We also know that current is related by:

Use Ohmís Law to get the effective resistance, R' in the primary coil:

If we have a load resistance, we know that it is given by:

So we can write:

In words, we can rewrite this as:

So we can make R' equal to the internal resistance of the source.

 

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