You need to use a 2:1 ratio transformer, with a capacity (in volt amperes) to match the load you have in mind.
No bell wire is not meant to be 230V.
The wattage would stay the same. It is the amperage that would change.
no way because frequency cannot change
230V
Its not the appliance that needs modification but the electrical delivery. You need a converter/transformer or adapter to change the way power is fed to the appliance. See the link provided for more explanation.
Your electrician is correct on this. However, the pump is designed for 230V and will use less electricity, thus saving money if wired for 230V. Yeah, if you have to rewire for 230 V then it would be more expensive until your savings had consumed or offset the expense.
Absolutely not.
residential usually 115v or 230v. Commercial could be 115, 208-230 or 460
If you live in an area that uses 115V as the mains supply, then it's absolutely fine. Equipment sold in the area will be designed to operate on that voltage and there is no difference in performance between 115V equipment and 230V equipment.
from the wall it could be 115v ac, or in non American countries that use it 230v ac. internal voltages range from 12v dc, 5v dc, 3.3v dc.
The 230v breaker is 2-pole, The 115v is only single-pole so YES you need a new breaker. DON'T use 2 single-pole breakers instead. The well pump will run to the pressure setting of the pressure switch controlling it, regardless of HP. The difference might be in the size of the pump in flow rating, I.E. a 1/2 HP pump rated at 10gpm @ 70 psi won't perform the same as a 3/4 HP pump rated at 20 gpm @ 50 psi. Check the pump curve and pressure switch setting. The pressure switch for the new pump will need both power leads connected to the switch (1 lead per contact set), not 1 wire as the 115v motor was.
it will not run
No bell wire is not meant to be 230V.
The wattage would stay the same. It is the amperage that would change.
if you drove the 18V winding with 230V the transformer would burn out, if it didn't catch fire first
Yes.
connect the Red Yellow blue phases