A:AnswerNot positive on the Voltage, but when i went to europe i had to buy an adapter that converts the plug so that i could use a lower voltage device aka my cell phone. So i am assuming you will need to do the same to avoid damaging the system. But if i recall correctly the adapter is fairly cheap and should be local to you.
A:AnswerWith the right kind of adapter to lower the voltage to 120v, it could work. However, the console's power adapter is only intended for 120v and uses a usb type-c charging cable.
A:AnswerWhen the Switch isn't connected to a TV you can either play with the controllers connected to the tablet or with the controllers separated from the tablet.