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Mar 27, 2020 at 22:01 comment added Transistor Bad idea. The motor is not a constant "resistance". It will be very low if the motor is stalled. It will increase as the motor speeds up. (The motor draws high current when stalled and low current when running close to rated speed.) Motors are usually run at constant voltage.
Mar 27, 2020 at 21:42 comment added ToucherOfRabbits I didn't realize just how wasteful the parallel resistance idea was initially. What if, instead of a parallel resistor, I add a motor with a little fan? Just a crazy thought. I'd be afraid of the light flickering, but maybe there's a solution to that?
Mar 27, 2020 at 21:21 comment added Transistor @Toucher: Sorry, for some reason I worked this out for a 4 A PSU. Yours is 4.8 A but you should be able to calculate the resistor values to get the control you want.
Mar 27, 2020 at 21:19 history edited Transistor CC BY-SA 4.0
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Mar 27, 2020 at 21:16 vote accept ToucherOfRabbits
Mar 27, 2020 at 21:13 history answered Transistor CC BY-SA 4.0