What device displays voltage as a waveform over time?

What device displays voltage as a waveform over time?

• A. Oscilloscope
• B. Multimeter
• C. Ammeter
• D. Power Supply

Answer: (A)

Visualizing how voltage changes over time is what the oscilloscope is for. It measures voltage and displays it as a graph with time on the horizontal axis and voltage on the vertical axis, so you can see the exact waveform shape—whether it’s a sine wave, square wave, pulse, or a distorted signal. This time-domain view lets you analyze frequency, amplitude, phase, and transients. A multimeter gives a single voltage value (DC or AC), not the evolving waveform; an ammeter measures current; a power supply provides voltage or current output but doesn’t show how the voltage varies over time.

Visualizing how voltage changes over time is what the oscilloscope is for. It measures voltage and displays it as a graph with time on the horizontal axis and voltage on the vertical axis, so you can see the exact waveform shape—whether it’s a sine wave, square wave, pulse, or a distorted signal. This time-domain view lets you analyze frequency, amplitude, phase, and transients. A multimeter gives a single voltage value (DC or AC), not the evolving waveform; an ammeter measures current; a power supply provides voltage or current output but doesn’t show how the voltage varies over time.