If you are talking about a plug rated at 20 A and not that the device it is attached to as drawing 20 A then nothing will happen unless the device along with other devices on the same circuit trip the breaker.
The rating of 20 A on a plug tells you the maximum current that should go through the plug. The 15 A breaker protecting the outlet ensures that no more than 15 A can go through your 20A plug.
Absoluteyl not.
yes
If it is a 30 amp breaker then it is a 240 volt outlet.
If the plug fits you are good to go. The typical range of residential voltage is from 110 to 125 VAC. You are fine within this range.
Yes is ok as long as you increase the size of the plug .I use dryer plugs( 30 amp )all the time on equipment that came with smaller plugs (20 amp).
15 amp outlet on a 20 amp circuit.
By today's NEC standards, all kitchens are required to have to have a minimum of two 20 amp circuits.
Absoluteyl not.
yes
If it is a 30 amp breaker then it is a 240 volt outlet.
yes
If the plug fits you are good to go. The typical range of residential voltage is from 110 to 125 VAC. You are fine within this range.
This can happen and may require opening up the guitar to retighten the loose amp plug fitting from inside.
No you can not you will need to replace the plug with a 4 prong the same as the style of your oven and change your breaker to the correct Amp for your style of 4 prong plug
If you are asking this question I assume that the outlet/plug is hot enough to be noticeable and it is likely a problem you should address immediately. As a start remove the plug from outlet and see if the outlet is still hot. If so, turn off the breaker controlling the outlet. Remove outlet from box and see if there is evidence of a burned or loose wire. If there are no obvious problems and the outlet is still hot with nothing plugged in, call an electrician; or if you know how replace the outlet with a 20 amp outlet. Otherwise it could be a faulty plug which you should replace. The only other thing that might be wrong is a faulty breaker that isn't tripping on an over current condition and the connected device is drawing too much current.
Yes is ok as long as you increase the size of the plug .I use dryer plugs( 30 amp )all the time on equipment that came with smaller plugs (20 amp).
A 15 amp 125 volt outlet is a household outlet.