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One way to consider AC and DC together, is this:
An AC signal is presumed to vary, UP and DOWN in potential, as a sine wave, in a positive and then negative fashion, varying around ZERO volts, or GROUND.
A DC potential is, generally, a stable POSITIVE (or NEGATIVE) potential greater than (or lesser than) GROUND.
By combining an AC signal with a DC potential, the GROUND that the AC oscillates above and below is altered to the potential of the DC level.
The oscilloscope demonstrates this phenomenon.
It's 2320 your time Graham, See ya on the morrow.
One way to consider AC and DC together, is this:
An AC signal is presumed to vary, UP and DOWN in potential, as a sine wave, in a positive and then negative fashion, varying around ZERO volts, or GROUND.
A DC potential is, generally, a stable POSITIVE (or NEGATIVE) potential greater than (or lesser than) GROUND.
By combining an AC signal with a DC potential, the GROUND that the AC oscillates above and below is altered to the potential of the DC level.
The oscilloscope demonstrates this phenomenon.
It's 2320 your time Graham, See ya on the morrow.