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Fan Speed Controler,


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The cheap lighting dimmers consist of a variable resistor inline with the device being dimmed. This dissipation of the extra power creates quite alot of heat, creating a fire hazard, also you dont save any power, as the extra power is being dissipated by the dimmer.

 

The more expensive, better quality fan controls are a variable inductor, this uses the principle of electro-magnetism to limit the current in the circuit. They generate very little heat and save you power and therefore money.

 

End of physics lesson!

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