Why are larger transformers more efficient than smaller ones?

[Alexander Max]

Homework Statement

Transformer efficiency loss

Homework Equations

Larger transformers are more efficient than smaller

The Attempt at a Solution

I understand the basics of energy loss through heat etc but i don't understand why it would be different for the sizes of transformers. Is it to do with hysteresis and eddy currents? If so how do they have an effect?

 

[DEvens]

Can you give a more complete description of the question to be answered?

Can you think of something a small transformer has relatively more of than a large transformer? Hint: Cube-square ratio.

 

[andrevdh]

Why would the transfromer need to be larger?
What would it physically involve if it is scaled up?
How does a transformer operate?
How would this mechanism be affected by scaling it up?
Can you suggest any involved equations?