In a digital circuit, what values can be represented?

In a digital circuit, what values can be represented?

• A. Any real value
• B. Only zero
• C. Zero or one
• D. A continuum of values

Answer: (C)

Digital circuits encode information with discrete voltage levels, using two distinct states. A single bit can represent either zero or one, and the circuit decides which state a signal is in by comparing it to a threshold, with margins to tolerate noise. Because the information is carried by these two fixed levels, the values that can be represented are zero or one. The other ideas describe continuous or analog quantities, which a digital system does not use for its fundamental signaling, even though real voltages may vary within bounds around the nominal levels. Hence, zero or one is the correct description.

Digital circuits encode information with discrete voltage levels, using two distinct states. A single bit can represent either zero or one, and the circuit decides which state a signal is in by comparing it to a threshold, with margins to tolerate noise. Because the information is carried by these two fixed levels, the values that can be represented are zero or one. The other ideas describe continuous or analog quantities, which a digital system does not use for its fundamental signaling, even though real voltages may vary within bounds around the nominal levels. Hence, zero or one is the correct description.