rheostatic

/ˌriəˈstætɪk/
adjective
  1. Relating to or functioning like a rheostat, a device used to control electrical current by varying resistance.
    • Old electric trains used a rheostatic braking system to slow down smoothly.
    • The engineer adjusted the rheostatic control to dim the stage lights gradually.
    • The technician explained how the rheostatic circuit regulates the motor's speed.
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