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What is the differences between "electric transformer" and  "electrical transformer"? 

Both terms refer to the same device, which is an essential component in the field of electrical engineering used to transfer electrical energy from one circuit to another while changing the voltage levels. The transformer works based on the principle of electromagnetic induction, where a varying magnetic field induces a voltage in a secondary winding, thereby stepping up or stepping down the voltage as required without changing the frequency.

In practical usage, people might use either term interchangeably to describe devices that transform voltages in electrical power systems, electronics, or any application involving AC (alternating current) power transmission. The prefix "electric" and "electrical" in this context serve the same purpose, emphasizing the relation to electricity.