Why is the efficiency 75% instead of 50% in the question below?
1 Answer
Jun 4, 2018
Because it is asking about the motor specifically.
Explanation:
8 units of energy are applied to the motor and the motor passes 6 units of energy to the remainder of the system.
On a percentage basis, that is 75%.
The graphic shows that the pulley wastes another 2 units of energy, but that is not the fault of the motor.
I hope this helps,
Steve
