2006-12-10 04:57:23 · 3 answers · asked by wisdom tooth 3 in Science & Mathematics ➔ Engineering
If you are using resistance to slow the motor then they both will consume the same energy. The slower motor will be much less efficient because the resistor will be consuming some energy.
2006-12-10 09:38:41 · answer #1 · answered by scubamasterme 3 · 0⤊ 0⤋
What consumes power in a fan is the work done - the movement of the air in CFM or any other units of volume per time.
So if one were to set up an experiment between a fast fan and a slow fan, one would find the most power being consumed by the fan moving the most volume of air per unit of time.
2006-12-10 13:54:32 · answer #2 · answered by www.HaysEngineering.com 4 · 0⤊ 0⤋
I disagree. The amount of current will be dependent on the total resistance and impedance of the circuit. At slow speed settings, the resistance of the speed control is added to the impedance of the fan motor. Less current will be used.
2006-12-10 14:41:37 · answer #3 · answered by Ed 6 · 0⤊ 0⤋