Dr. Slick wrote:
"Err, Cecil, dQ/dt is zero at the voltage nodes."

dQ/dt is the rate of change in electrical charge with respect to time.

Charge moves in synch the applied voltage in a resistance. So, a
sinusoidal voltage node is a point in the cycle where the voltage has
zero amplitude, and so does the current. dQ/dt is hardly zero at zero
crossings of the a-c waveform.

A standing wave node is different. The voltage is always zero at a
complete cancellation type standing wave node because at all points in
the cycle the voltage sum is zero if the node voltage is composed of
equal and oppositely phased waves. The nodal point is a minimum but is
not nescessarily a zero point if the reflected wave is not the equal of
the incident wave.

In the sinewave cycle, zero amplitude occurs at zero crossing points in
time. The rate of change, or slope of the a-c charge movement line is
maximum at zero-crossings, i.e., the change in movement of charges is
most at zero-crossings.

At positive and negative peaks of the sinewave, the slope is zero.

Cecil wrote:
"Nope, not over half a cycle, it isn`t (starting at the zero crossing)."

Cecil is getting at the effective value of an a-c waveform which is rms.

Slick and Cecil are talking about two different things.

Best regards, Richard Harrison, KB5WZI