Reduce Fan Speed Using Resistor

The resistor will dissipate 0 55 50 25w.

Reduce fan speed using resistor.

If we use a 10kω as our r1 resistor plugging in the values we get r2 v r1 vin v 1v 10kω 5v 1v 2 5kω. Say if you have the same circuit above with 5v but only want 1v. High protein breakfasts especially ones that include eggs nnbsp have been linked to weight loss reducing reduce fan speed with resistor belly fat in the process add eggs to salads stir frys and sautés or pair them with 100 whole grain toast and veggies for a hearty breakfast. If the motor draws constant current then the resistor will drop a constant voltage and the motor will run at a fixed lower speed.

As for the resistor wattage here comes the good news. You can use a selector with more positions for more speed adjustments. This highlights one potential pitfall of this method you can t safely use 1 4w resistors for this unless you make up the target resistance using several smaller resistors of equal value in series. I m not sure how slow the fan will go though.

On the third position 3 resistors takes part and on the last position there is no resistor connected. So it s easy to see now how any voltage can be obtained with a resistor voltage divider circuit. The problem with using a series resistor is that its voltage drop is proportional to current. But notice that you are wasting 15w of power.

So to achieve a voltage drop of 5v we would need a resistor with value of 42 ohms and capable of dissipating 0 6w of power. The speed of a permanent magnet dc motor is primarily determined by voltage. Let s do one more example. The more the resistors that takes part the more the voltage drop generated thus the less the speed of the motor.