Transformers

[Zigi]

Hey guys, I'm just curious to know, what exactly causes magnetic flux in a transformer?

Thanks

[rlenora]

Magnetic flux = magnetic field going through a certain area (flux = B x A)

A transformer has a primary coil, connected to an AC power supply, and in which an AC current flows.
Since current carrying wires have a magnetic field around them, there is a magnetic field through the primary coil. There is B going through A, hence there is magnetic flux.

Since the primary coil is connected to an AC power supply, and an AC current (constantly changing direction and magnitude according like a sine curve) is flowing through it, the magnetic field through the primary coil is constantly changing. Hence there is actually a CHANGE in flux.

Hope this helps Zigi

Let me know if you'd like clarification on any part!

[Zigi]

Thanks that makes so much sense now!