In an ordinary Transformer which of the following does not change

A. Voltage 
B. Current 
C. Frequency
D. All of the above 

Answer: C. Frequency

Explanation:
The function of the transformer, as the name implies, is to transform alternating current energy from one voltage to another voltage.

When energy is transformed to a higher voltage the transformer is called a step-up transformer and energy is transformed to a low voltage the transformer is called a step-down transformer. 

If the power varies the current varies while the voltage remains fairly constant.

The working principle of a transformer is very simple. Mutual induction between two or more windings (also known as coils) allows for electrical energy to be transferred between circuits.

A transformer is a device that transfers electric energy from one alternating-current circuit to one or more other circuits, either increasing (stepping up) or reducing (stepping down) the voltage.

The transformer is a static electromagnetic device that transforms the voltage from one side of its coil to the other side of the coil without a change in frequency.

If there are more turns on the primary coil than the secondary coil than the voltage will decrease (step down).

If there are less turns on the primary coil than the secondary coil than the voltage will increase (step up).

The rate of change of flux linkage depends upon the amount of linked flux with the second winding.

The purpose of the transformer core is to provide a low reluctance path, through which the maximum amount of flux produced by the primary winding is passed through and linked with the secondary winding.


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