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NO - that is dangerous.
using step up transformers
You need a 110 v to 220 v transformer, which will be inexpensive for supplying an alarm clock. That steps up the 110 v suppy into 220 v for the clock.
No, do not put terminate 2 different voltages in one box.
They are in tandem because they power a 220 VAC circuit, rather then a 110 VAC circuit.
no they dont
The white (or neutral) wire is not involved in a 220 circuit. Using US NEC conventions, red and black in a 120/240 split phase service form the 240 (220) circuit. The neutral (white) wire is only used when you want 120 (110) volts.
LCM of 110 and 220 is 220.
Yes. 110 and 220 plugs are different so that you cannot plug a 110 recepticle into a 220 outlet and vice versa. If a home is wired for 220 it means that the potential is there for 220 recepticles. Your oven and clothes dryer require 220.
Yes, 120 and 240 volts can be run in the same conduit.
If you are no longer using the dryer and there are 4-wires, and the dryer was 220 to 240 volts, it can be split into two 110 to 120 Volt circuits.