Does bigger wires have less resistance than smaller wires?

Question

Does this explain why higher kva transformers provide higher short ciruit currents than smaller ones?

Answer 1

Yes absolutely

Answer 2

Yes larger wires, cables, and bus bars have more cross sectional area for the current to flow through which increases the conductivity. Conductivity is the reciprocal of resistance. The more conductance you have the less resistance to current flow you have.

On general power distribution transformers. i.e. like the kinds you find at sub-stations and power houses, you can make that general statement if you qualify it as such.

However, that is not necessarily true about higher KVA rating equaling to higher short crust currents.

That is going to depend on the design of the transformer. i.e. type of transformer. How it is wound and the size of wire used winding it. The type of core if any.

I have seen 120 KVA transformers which look identical to sub station transformers whose short circuit current was only 10 amps.

You have to been careful making a general statement like that since there are all types of transformers from general power distribution transformers to special transformers designed for Electro static testing to transformers designed for testing insulation on motors, and electrical wire and cable.

Answer 3

If they're made of the same stuff, then yes.

Bigger wire=less resistence.

Answer 4

'Yes` bigger wires have lower resistance.

'No' on the transformer part of your question.

With the transformers, 'magnetic saturation`

plays a major part in current limiting.

The impedance of a transformer is not only resistance.

Google or Wiki 'Choke coil'