Question: Would I be able to use an iMac from England in Canada. I am not thinking there would be any problems with the software it is the electrical part of the equation I am concerned with. Easy enough to get an adapter for the plug but will the difference in voltage and hertz cause any problems?
You will be fine as long as you'll use the appropriate plug for your country.
iMacs use a three-pin plug and the internal PSU can be used with electrical outlets used in England as well as in Canada.