**
Tutorial 10 - Extension**

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

We also know that current is related by:

Use Ohm’s Law to get the effective resistance, *R'* in the primary coil:

If we have a load resistance, *R¸* 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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