Final answer:
An oscilloscope is an instrument that displays an instantaneous voltage. It is used to observe and measure electrical waveforms.
Step-by-step explanation:
An oscilloscope is an instrument that displays an instantaneous voltage. It is commonly used in physics labs to observe and measure electrical waveforms. Unlike a digital logic probe or an ammeter, which are used to measure current or logic levels, an oscilloscope allows you to visualize voltage changes over time.