# Does impedance limit the current in a transformer?

High frequency is suitable for small transformers with ferrite core, but that causes high impedance. Can we use that impedance to limit the current in a transformer of 1:1 ratio to 1 A without overheating or dissipation of energy?

In a transformer, the inductance of each coil is measured as the inductance with the other coil forming an "open circuit."
When you short the secondary coil in a transformer, the inductance of the primary coil drops dramatically.

If I understand the intent of your question correctly, this is where your intended use of a "high impedance" (although it'd be correctly stated as "high reactance" or "high inductance") primary coil to limit overall transformer current flow will break down.
In order to limit the max. possible output current of your transformer to a certain value, the resistance (not reactance, just resistive losses) in the coils and the magnetic losses in the core+coupling between the two coils would have to be great enough to limit the current to that amount.
This would, unfortunately cause highly inefficient operation, high losses, and likely the overheating that you are wanting to avoid.

• How do airgaps alter the behavior? Apr 23 '17 at 22:44
• @analogsystemsrf Honestly, I don't know much about the effets of airgaps in transformers yet. So far, the only reference I've seen to them in my research are a few references to airgaps being incorporated in the core material for flyback transformers, in order to add some reluctance. Apr 23 '17 at 23:06
• @RobhercKV5ROB i am really confused now so its the inductance and not the impedance right?