A 12v will burn out a 9v keyboard.
No. The 12V supply will overcharge the 9.6V pack. However, my Drillmaster 18v cordless drill has a charger that reads output 22v.
Sure
A: YES the higher the number the better it is for conduction . But never the other way around
If you can get the battery to run the motor, write it up in a science journal. You'll be rich. Sure but what are you going to use to power the 12 volt motor? You will have to use another battery which you could just use to power the radio in the first place.
Yes the power pack can supply up to 1 A, so 500 mA or 0.5 A is within that limit.
Nope.
No, 12 volts means 12 volts. Anything less will not work and anything more will not work.
no
use two 12 volt batteries in series.
No
Using a 10 volt power supply for a 9 volt keyboard is not a good idea. The higher voltage will cause damage to the keyboard, burning it out and making it useless.
No. The 12V supply will overcharge the 9.6V pack. However, my Drillmaster 18v cordless drill has a charger that reads output 22v.
Probably not much because 6 Volts is not enough to power a 12 Volt coil
Do you have a choice ? All my power tools are 110 volt, so that is what I use.
Use a transformer.
Sure
You use the capital letters.