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April 19, 2024, 03:06:16 pm
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Author Topic: *thought*  (Read 1468 times)  Share 

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Galelleo

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*thought*
« on: November 11, 2007, 10:43:47 am »
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Are eddy currents in this years study guide?

We never learnt about them in class, but ive seen them around.
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Light a man a fire and he will be warm for the rest of the night.
Light a man ON fire and he will be warm for the rest of his life.

Collin Li

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*thought*
« Reply #1 on: November 11, 2007, 10:45:12 am »
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Nope. Eddy currents are a type of inefficiency within the iron core. We assume transformers are Pin = Pout.
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Galelleo

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« Reply #2 on: November 11, 2007, 11:15:26 am »
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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?
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Light a man a fire and he will be warm for the rest of the night.
Light a man ON fire and he will be warm for the rest of his life.

Collin Li

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*thought*
« Reply #3 on: November 11, 2007, 11:26:14 am »
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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).
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