An alternating current (ac) supply is connected across a resistor. The supply provides a sinusoidal output with a peak voltage of 24 V24\text{ V}24 V.
Calculate the root-mean-square (rms) voltage of the supply.
An oscilloscope is connected across the resistor to monitor the waveform. The trace on the screen shows a peak height corresponding to exactly 4.04.04.0 grid divisions above the central axis. Determine the yyy-voltage gain setting of the oscilloscope in V div−1\text{V div}^{-1}V div−1.
The ac supply is then replaced by a square-wave generator. A new trace is obtained on the oscilloscope with the same yyy-voltage gain. A single complete cycle of this square wave is observed to span exactly 8.08.08.0 horizontal grid divisions. The time-base of the oscilloscope is set to 2.5×10−4 s div−12.5 \times 10^{-4}\text{ s div}^{-1}2.5×10−4 s div−1. Calculate the frequency of the square-wave signal.