High voltage

[Paul-R]

Can we use a Microwave Ovens transformer to generate high voltage from a 12 volt battery?
A Microwave Ovens transformer can usually convert 120V to 2500V, I was wondering if we can plug a 12V and hope something like 250v ?
Can we use it directly or we need some kind of circuit to be able to use it?
thanks

Microwave ovens often contain a glorious transformer which is 8:1. It turns
mains voltage (240 volts in the UK) into almost 2000 volts.

But transformers will only work with AC, Alternating Current. They will not
function with Direct Current. (They will probably melt and burn)

If you want to alter voltages, start with AC, transform them, and
then use a rectifier to get them back to DC. A bit wasteful, and there
are cleverer methods like DC-DC converters.
Paul.