Voltages are considered which type of signal?

• A. Analog (continuous)
• B. Digital (discrete)
• C. Pulsed
• D. Transient

Answer: (A)

Voltages are analog signals because they vary smoothly over time and can take essentially any amplitude within a range. This continuous nature means the voltage at any instant holds a real value, capturing the full detail of physical quantities like sound or temperature. Digital signals, in contrast, use discrete levels (like 0 and 1), representing information in steps rather than a continuous spectrum. Pulsed signals describe waveforms that are on for a finite time and then off, and transient refers to brief, non-steady disturbances; these describe specific shapes or events in a signal, not the overall type of signal a voltage represents. In practice, we often convert analog voltages to digital form with an ADC, but the fundamental signal type for a voltage itself is analog.