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If you want to control a light with one switch, you need a one way switch. If yoou want to control a light with two switched, yoou need 2 (No) two way switches. However if you want any more you will need additional INTERMEDIATE SWITCHES. You can have as many as you like. They have four...

Further to above. To say your supply is rated at 12Kw is meaningless. The limitation on any supply is the current that can be drawn (or the voltage x that current.) NOT KW but KVA. So if you had a heating load, KVA is the same as KW. But if you have a motor you will only be able to draw less...

Well the first thing is that Volts X Amps does not give watts in alternating current Watts = volts X amps x cos phi (phi is a greek letter) and = cosine of phase angle between volts and current The amps and volts are not synchronised in AC and therefore cannot be simply multiplied...