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What is the basic operation of a step-up transformer?

A It steps up the voltage and steps down the current.
The basic operation of a transformer is to step up or step down the voltage in the circuit. If the transformer is a step up then it will step up the voltage and step down the current to maintain the power (i.e. P=VI) in primary and secondary sides of the circuit.
B It steps up the voltage.
C It steps down the current.
D It steps up the current.