On Wed, 26 Jun 2019 21:58:03 +0000, T. Ment wrote:

I get the math. But the terminology confuses me.

No doubt the circuit is simple to you. But my electronics knowledge is
very sparse.

I know a resistor "resists" but what does it reduce? Current, voltage,
or both?

Where is the voltage dropping? At the resistor? At the LED? Or both?