Good to know we can't be replaced by ChatGPT.
In circuit models, a voltage source is a two-terminal component.
Instantaneous voltages add when two sources are connected in series.
Note: to do what you asked, we need an AC source with voltage amplitude of 100 V.
It would generally be identified as a 70.7 volt AC source, going by its RMS voltage.
An exception relevant on HV forum is the nameplate on X-ray transformers, where the term "kVp" follows the peak voltage in kV.
It's traditional but kind of sloppy, since kVp is not a unit of measurement. Same goes for stating wall voltage as 120 VRMS.
RMS is generally implicit when speaking of AC voltages and currents, including RF transmitter and receiver and random noise signals, and capacitor ratings.
What would a typical portable "True RMS" voltmeter indicate if connected to the combined waveform in picture above?
In DC-volts mode it would say 100 V, having averaged out the AC.
In AC-volts mode it would say 70.7 V, having switched to AC coupled input.
To get the RMS value of composite waveform (swinging 0 to 200), user can add the squares of DC and AC components, then take square root of sum.
DC source alone produces 10 watts of heat in the load resistor.
AC source alone produces 5 watts of heat in the load resistor.
The two sources in series produce 15 watts.
It works that way because the DC and AC components are orthogonal. It would not work if we combined two DC or two AC sources.
