What is Cathode Ray Oscilloscope (CRO)?
A Cathode Ray Oscilloscope (CRO) is an instrument that makes use of an electron beam and a cathode ray tube to display and analyze waveforms from electrical circuits. It is basically a very fast X-Y plotter that can display an input signal versus time or another signal. The voltage and time describe a shape and are continually graphed next to a scale because the oscilloscope monitors change in electrical signals over time.
and the current i to the quantity of electricity (or charge) is given by the relation
Extra :
We can examine parameters, such as amplitude, frequency, rising time, distortion, time interval, and others, by studying the waveform.