An oscilloscope is primarily used to measure what?

The oscilloscope is primarily utilized to measure voltage over time and to visualize waveforms, which is crucial in electronic diagnostics and design. It provides a graphical representation of voltage signals, allowing technicians to analyze the amplitude, frequency, and shape of waveforms present in electrical circuits. This capability is essential for assessing the performance of circuit components and debugging issues.

Options related to resistance, current flow, and power consumption do not align with the primary function of an oscilloscope. While specialized instruments exist for measuring resistance and current, an oscilloscope focuses on voltage signals and is invaluable for observing dynamic changes in those signals over time. Therefore, option B accurately reflects the primary use of an oscilloscope in the realm of electronics.