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**high voltage but low current...how??**

we know that the potential difference between two points is the driving force for current , so in this sense more the potential difference or voltage between two points more is the current...

but a transformer produces either very high voltage but low current OR very low voltage but high currents, doesnt this go against the initial theory of how current is produced...?? i.e more the voltage stronger the current.

the expression P = I x V says that if the power is kept constant I is inversely proportional to V...but this contradicts the ohm's law that V= I x R

i've never been able to grasp this concept any help is appreciated...thank you.