Question

How does a transformer use mutual inductance?

Options

• It transfers energy using loosely coupled coils without physical contact.

• It steps up or steps down voltage using tightly coupled coils with \[K\approx 1\] .

• It makes the coil axes perpendicular so that \[M=0\] .

• It induces current in cookware using the cooktop coil.

Answer 1

A transformer uses tightly coupled coils to step up or step down voltage. Their coupling factor is close to one: \[K\approx 1\] .