Electronics Fundamentals/Electromagnetic Devices/Transformer

Transformer

A transformer is an electronic component that has the capability to increase, decrease or buffer voltage

Construction

Transformer is constructed from two coils wounded on two sides of a square

${\frac {V_{o}}{V_{i}}}={\frac {N_{2}}{N_{1}}}$

Operation

From above,

$V_{o}=V_{i}{\frac {N_{2}}{N_{1}}}$

Step Up Voltage

$V_{o}>V_{i}$ when $N_{2}>N_{1}$

Step Down Voltage

$V_{o}<V_{i}$ when $N_{2}<N_{1}$

Buffer

$V_{o}=V_{i}$ when $N_{2}=N_{1}$

Reference

• Transformer