ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: Galelleo on November 11, 2007, 10:43:47 am

Title: *thought*
Post by: Galelleo on November 11, 2007, 10:43:47 am

Are eddy currents in this years study guide?

We never learnt about them in class, but ive seen them around.

Title: *thought*
Post by: Collin Li on November 11, 2007, 10:45:12 am

Nope. Eddy currents are a type of inefficiency within the iron core. We assume transformers are Pin = Pout.

Title: *thought*
Post by: Galelleo on November 11, 2007, 11:15:26 am

i know were using ideal transformers, I thought eddy currents were just any current thats induced in a chunk of iron etc... I guess its not important?

Title: *thought*
Post by: Collin Li on November 11, 2007, 11:26:14 am

Quote from: "Galelleo"

i know were using ideal transformers, I thought eddy currents were just any current thats induced in a chunk of iron etc... I guess its not important?

Eddy currents are a form of Joule heating, which means energy goes into heating the iron core rather than generating electricity on the other coil. It thus contributes to efficiencies less than 100%, and therefore is not interesting on the VCAA course (where 100% efficient transformers are only discussed).