Posted by Nick on Thursday, January 24, 2008 at 2:50pm.
A motor running at its rated power provides 2.6 lbft torque at its rated speed of 2020 rpm. The motor draws 5.6A from a 230V supply at a phase angle of 37 degrees. Determine the following: The horsepower delivered by the motor, The efficiency of the motor.

Electricity  drwls, Thursday, January 24, 2008 at 4:43pm
Get the motor electrical input power Pin (in Watts)from the product of current, voltage and the cosine of the phase angle.
Get the delivered power Pout (in Watts) from the product of torque and angular velocity. Make sure the torque is in Newton meters and the angular velocity is in radians/sec
The motor efficiency is Pout/Pin