Question #7c310

1 Answer
Nov 28, 2017

While the flow of electrons (current) is the same for both motors, the driving force (voltage potential) is #6.bar6# times greater in the #120# VAC motor compared to that of the #18# VDC motor.

Explanation:

The difference is evident in the first line of the question; the available power is much greater for the higher voltage engine.

As a result, its torque will also be significantly larger under similar operating conditions (speed, efficiency).

#tau=(I*V*E*60)/(r*2pi)#

#tau=#torque
#I=#current
#V=#voltage
#E=#efficiency
#r=#rpm

There is more information here:
http://simplemotor.com/calculations/