Which term describes the plots that illustrate how a signal evolves over time?

• A. Waveforms
• B. Sine Waves
• C. Square Waves
• D. Voltage

Answer: (A)

A waveform is the graphical representation of how a signal changes over time. It shows the instantaneous value of the signal (often voltage) plotted against time, so it directly captures how the signal evolves moment by moment. Sine waves and square waves are specific shapes a waveform can take, representing particular periodic patterns, but they’re just examples of waveforms. Voltage is the actual quantity being plotted in many cases, which produces a waveform when you chart it over time, but it isn’t the term for the time-based plot itself.