Question

Question #7c310

Answer 1

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/