110V transformer on 220V?

[nedfunnell]

Is this going to cause a thermal event? I know that I'll theoretically get 2x the output voltage, which is what I want. Impedance is frequency-dependent and not voltage-dependent (right?) so I should just see 2x (4x?) the parasitic power. Is that all? Or will I burn something up?

 

[major]

You'll pop the circuit breaker or blow a fuse. The 110V primary will saturate at 220V and draw a bunch more current.

 

[bigmoose]

As stated above the core will saturate, likely around 135 to 150 Vrms on the primary. It will then cease to have an effective inductance, but will retain the primary resistance for a bit. The primary will become a thermal heating element for the part of the cycle between 140ish Vrms and 220 Vrms. It will end with a thermal event, likely burning open the primary. Other possibilities are blowing a fuse or circuit breaker.