Why don't transformers burn?

I don't know how transformers work but the primary coil has a closed circuit. If there is 0 load on the transformer it would short circuit

• Look up inductors Commented Mar 26, 2021 at 12:53
• Do you mean no load or zero ohms load on the transistor output? A short circuit connected to transformer secondary could very well make it short and burn. Commented Mar 26, 2021 at 12:56
• @Justme The primary coil is directly connected to Live and Neutral. That's what I'm talking about. I have no idea how transformers work btw Commented Mar 26, 2021 at 13:00
• By the way, "short" in the "short circuit" means "wire without impedance", which a coil is not. Commented Mar 26, 2021 at 13:06
• @SamPan "I have no idea how transformers work btw" doesn't this mean that you have to find out how they work before asking why they don't burn? Commented Mar 26, 2021 at 15:35

This would only be true if you connected the transformer to DC source (and the coil would consist of an ideal conductor with zero resistance). But normally a transformer will be connected to AC source and then you have to take in mind the reactive resistance of the coil which is $$\X_L = 2π·f·L = L·ω\$$. With voltage V you get a current of $$\I = \frac{V}{X_L}\$$. Voltage and current are out of phase by 90 degrees, so this (ideal) transfomer doesn't dissipate any energy.