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A transformer is used for changing the value of
Question

A transformer is used for changing the value of

A.

Voltage

B.

Frequency

C.

Power

D.

Power factor

Correct option is A


A transformer is used for changing the value of voltage. 
Explanation: A transformer works by altering the number of turns on its primary and secondary coils, which allows it to increase (step-up) or decrease (step-down) the voltage of an alternating current (AC) circuit, while keeping the frequency relatively constant. 

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