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Old 10-17-2019, 11:08 AM   #4
Join Date: Apr 2014
Location: Southern Delaware
Posts: 2,170
Scales Modeled: O, O27
Originally Posted by BigAl56 View Post
I thought the rheostats job was to create a different fixed voltage, 6v for lights for example.
If left alone, yes. But the sliding nature of the control arm allowed it to be used for speed control when attached to a fixed voltage output.

But to answer the OP's original question, I don't know why it would be used on a variable voltage output.
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