Tell us about yourself!
There's a few apps on the app store for smart phones that can do all the calculations for you as long as you have all the values.
Well good for you powering your house from a lighter. Meanwhile the rest of us are thinking in reality.
A 12v Tesla Coil needs 12 volts to run. That will then be stepped up to a few thousand volts on the output (top load) of the coil. So yes it is dangerous. If you want to run 12v appliances, then use a 12v power source.
Small Wind Powered Generator