As we already know the computer electronic components receive the power as voltages. But, basically the computer data is digital. These voltages have to be represented as binary 0's and 1's and there are sophisticated components used for this purpose.
For example, consider a flip flop which has the capability of storing only one bit at a time. It can store a binary 0 or a binary 1 at a time. This status of the flip flop(either having 1 or 0) can be represented by voltages. For example, binary 1 held by a flip-flop is represented by +5V and 0 by +0V.
The same method can also be applied to registers since the register is a group of flip-flops.
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