How does the processor work at the physical level in the example of adding two numbers (banal 1 + 1)?

Question

Iron

Addition of two numbers:
There is one unit: 0000 0000 0000 0001
There is another unit: 0000 0000 0000 0001
How did it turn out with the help of electric current: 0000 0000 0000 0010?
Why did the unit shift by 1 digit to the left, which caused the second transistor to fill with current and the first one to empty, and what circuit forced it to figuratively assume that this is the sum of the addition of two numbers?

Answer 1

Learn and understand in order:
A good training video from the times of the USSR about the operation of transistors in Russian: here
2. Binary number system
3. Bit operations
4. Diode-transistor logic
This is the implementation of a replica on Unity from this mechanical ( video ):