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A testing instrument that's used to measure electrical signals in a circuit and display them as waveforms on a screen is called a/an A. oscilloscope. B. signal generator. C. multimeter. D. power supply.

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The answer is A. Oscilloscope

An oscilloscope is used to display waves - displays waveform of a signal. Feature such as its time base settings allow to measure the frequency and peak of a wave.

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