- #1

- 41

- 2

## Homework Statement

Hello, i decided to sign up here to ask one question: A dc motor with load has verry small resistance. We can almost say the resistance is only that of the copper. Without load the motor is accelerating as much as it can per given voltage and it generates strong back emf that resists the flow of current, hence the rrsistance is big. So can we say for the sake of calculations that: I=V-Vemf/Rwire. Then we just divide that current on the battery Voltage and find the overal resistance: Re=V/I. In other words we express that back emf as a resistance