As a technician you have come across many transformers, First on the list is step down transformer which work is basically to step down voltages like 110Ac to 12Vac or 240Vac to 12Vac etc.
We also have step up transformer which steps up the
voltage, a good example is fly-back transformer.
Another transformer available in the market is
isolation transformer (this transformer has the ratio 1:1) which means if you
give it 110Vac on the primary you will get 110Vac on the secondary side. Give
it 240Vac on the primary and you get 240Vac on the secondary side.
So what is the purpose of using this transformer and
get the same voltage (results)
This is where isolation (separation) comes in. this
means even if the secondary voltage is still the same, it is not connected
directly to the main supply but done in isolation (magnetically) so to speak.
