How does a transformer change voltage and current?

Answer 1

A welding transformer uses the alternating current supplied to the welding shop at a high voltage to produce the low voltage welding power

Answer 2

A three phase transformer is used to step-up or down three phase voltages. All the 3 phase windings can be contained in one transformer, which is cheaper but usually limited to lower power situations, and when in fails the whole thing would need to be taken out of service. In larger applications, such as distribution, they usually use three separate single phase Transformers that have higher power ratings due to the fact that they can dissipate heat better. These are more expensive implement but cheaper to maintain.

Answer 3

A transformer relies on electromagnetic coupling to transfer power between two electrically isolated circuits. The transformer may step-up or step-doen the voltage or even perform 1:1 transformation for isolation purposes.

Answer 4

A transformer works through mutual induction, whereby a changing current in one coil induces a voltage into a second coil.

The transformer winding (coil) connected to the supply is termed the primary winding, while the winding connected to the load is termed the secondary winding, and it is the ratio of the turns in each of these winding that determines whether the transformer is a step-up transformer or a step-down transformer. For example, if the secondary winding has twice as many turns as the primary winding, then the secondary voltage will be twice the primary voltage.

The secondary current, which is determined by the load, determines the primary current by the reciprocal of the turns ratio. So, in the above example, the primary current will be twice the value of the secondary current.

Answer 5

Transformers work on the principle of mutual induction, whereby a changing current in the primary winding creates a changing magnetic field that links with the secondary winding, inducing a (secondary) voltage into that winding.

Answer 6

Whether a transformer increases or decreases the input voltage depends on the number of coils on each side of the transformer .

thats the answer believe me its right !!!!!!!! ____