Question text
14 An electric motor is used to lift a load at a constant speed. electric motor power supply load The gravitational potential energy (GPE) stored in the load increases. The moving load also has stored kinetic energy (KE). Which expression is used to calculate the efficiency of the motor when the load is being lifted at a constant rate? GPE gained per second A efficiency = KE gained per second GPE gained per second B efficiency = power supplied power supplied C efficiency = GPE gained per second power supplied D efficiency = KE gained per second
14 An electric motor is used to lift a load at a constant speed.
electric motor
power
supply
load
The gravitational potential energy (GPE) stored in the load increases.
The moving load also has stored kinetic energy (KE).
Which expression is used to calculate the efficiency of the motor when the load is being lifted at a
constant rate?
GPE gained per second
A efficiency =
KE gained per second
GPE gained per second
B efficiency =
power supplied
power supplied
C efficiency =
GPE gained per second
power supplied
D efficiency =
KE gained per second
Select your answer: