Question

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

Explanation:

AC voltage is alternating current voltage, which changes direction periodically. The waveform of AC voltage is a sine wave. Among the given oscilloscope images, the one with a smooth, repeating curve (sine - wave - like) is the AC voltage.

Answer:

The second image (the one with a smooth, curved waveform) is that of an AC voltage.