how can you find out the voltage of a drill?

Error on the safe side and try a 120 plug. It will either work or it won't. Have you thought that the drill may be faulty, and that's why the plug was cut off?

Plenty good answers, but modern appliances are much safer in the main.

If it doesn't have a label on it may be very old, I would guess at least 20 years, with a metal case or a rubber cord which has perished. Or it may just be full of dust so it doesn't work.

I would go to a repair shop or an electrical outlet and ask them if they think it's safe to use. They probably have a tester they can use to check if it's safe. I wouldn't use it unless it tests safe. Portable mains appliances are the highest risk ones as far as getting shocks is concerned.

You should say what country you are in when asking questions like this.

In the UK or EU a power tool with a yellow sheathed power lead normally 115v and intended to be used with a "site transformer"; if the power lead is orange, blue or other colour it will be 230v.

If you are in another country then you'll have to find out the make and model somehow and look up the manufacturer's data. If there is no maker's label then search by trying to find one which is exactly the same shape and size. Try around a few good DIY shops or building sites to see if anyone recognises it.

It is 3 wire or 4 wire ?

If 3 it's 120V

If 4 wire 220V

few if any drills in the U.S. are above 120V you could look at the casing of the drill on the side most will list something unless its REALLY old.

its normally 240 volts uk ...except on building site where its 110 v ....

small tool repair shops can replace the power cord == there may be a bench charge === and if it is 220volts then toss it ......