Question

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which of these oscilloscope images is that of an ac voltage?

Explanation:

Step1: Recall AC voltage characteristics

AC voltage has a sinusoidal or oscillating pattern that alternates direction.

Step2: Analyze each image

• The first and fourth images have a step - like pattern (DC - like in a sense of having fixed levels in a non - alternating stepwise manner).
• The second image has a smooth curve but not the typical oscillating pattern of AC (could be a non - AC signal like a slowly changing DC or a different type of signal).
• The third image has a clear oscillating (zig - zag) pattern which is characteristic of AC voltage (similar to a crude representation of the alternating nature of AC).

Answer:

The third oscilloscope image.