[Cboldt]

-- Transformers do more than step up and step down voltages. They also change the frequency in order to decrease line losses and reduce the heat (another form of loss). --

They can't change the frequency, and if they did, it would lead to all sorts of interesting effects ;-) What transformers can do (and in fact, are physcially destined to do) is change the phase angle relationship between incoming power and outgoing power - something called "power factor."

[raybbr]

What transformers can do (and in fact, are physcially destined to do) is change the phase angle relationship between incoming power and outgoing power - something called "power factor."

Not really a transformer. That would be a one to one induction coil. Transformers, by definition, change voltage.