Digital switch?

Marks256 said:

What do you mean by "voltage across it"? The power going into it, or the amount that it reduces?

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It means the 'voltage across it', voltage at the high end, minus the voltage at the low end - or stick your meter directly across the resistor and measure the voltage across it.

You were 'probably' correct wih "the amount that it reduces", but it's not a very accurate term.

Oh, ok. Thanks Nigel.