Help on Transformers (1 Viewer)

[icycloud]

Hey all,

Just a quick question.

State and explain two reasons why a transformer might not transfer electrical energy with 100% efficiency.

I know one reason is because eddy currents would be induced and thus cause the transformer to heat up and energy will be lost due to thermal energy.

What might another reason be?

Thanks in advance.

 

[Riviet]

I know this is not explaining but other possible losses could be due to heat losses in the coils and magnetic leakage.
If you want, instead you could relate energy losses in power transmission lines using P_loss=I²R. Mathematically, we could show that if P=VI, then as V approaches infinity, I approaches zero but can't equal zero, hence there is always a little resistance no matter how small I is reduced. Hope that helps.

 

[STx]

Also it is impossible to have 100% effieciency i think, unless in a perfect world. i.e. "this ideal goal can only be met if there is perfect coupling of magnetic flux between primary and secondary windings".

 

[pkc]

A major cause of transformer inefficiency is heat loss from current resistance in the windings on both sides of the transformer.