In simple terms it's a power supply that chops down input voltage and current into short bursts (by rapidly switching the transistors on and off, hence the name), that allows for use of much smaller transformers than in linear power supplies (older type) because transformers lose less energy in the intermediate state which is the shorter the higher switching frequency.

Normally it is written on the plug, device or stated in the manual. Most devices can handle both ranges (it will be stated as a range, e.g. 110-250V (AC), if it is usable for 220-250V you can assume the frequency is not a problem for Europe neither, and same for 110VAC elsewhere. This is a disguised good question.

You use a one phase motor because you don't have three phases. That means using phase-phase voltage on it wouldn't make sense, you should be using a three phase motor instead. The 120V vs. 240V is not related to phase to phase voltage(or live wire to live wire) as that would be \$120\sqrt(3)\approx 207V\$.

The voltage rating displays the “not to exceed” rating, which means you can replace a 370v with a 440v but you cannot replace a 440v with a 370v. This misconception is so common that many capacitor manufactures began stamping 440v capacitors with 370/440v just to eliminate confusion. You Can Test a Capacitor While the Unit is Running

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can i use 250v in 230v