230 volts
Two wires are needed for 220 volts.
There are no volts in a light. A light consumes power.
You require about 24 volts to power the windshield wiper.
Onions don't have volts.
6.3
none is magic
200
Zero. Watts is the product of Amps x Volts. As you can see an amperage value is needed. Voltage = Watts/Amps. Volts = 200/? 20 volts
Watts and Volts are different units. It is like asking how many apples are there in 6 oranges. Watts = Volts x Amps x Power Factor Power Factor ranges from zero to one.
I believe is 12 to 14 volts.
The equation that you are looking for is I = W/E. Amps = Watts / Volts.