Calculate Efficiency of Motor Lifting 0.050kg Block at 0.40m/s

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SUMMARY

The discussion focuses on calculating the efficiency of a motor lifting a 0.050kg block at a constant velocity of 0.40m/s, with a current of 85mA and a potential difference of 3.0V. The electrical power is determined to be 0.255W, while the gravitational potential energy change is critical for calculating efficiency. The final efficiency of the motor is calculated to be approximately 69.87%, based on the relationship between the power required to lift the block and the input electrical power.

PREREQUISITES
  • Understanding of gravitational potential energy and its calculation
  • Familiarity with electrical power calculations (P = VIt)
  • Basic knowledge of Newton's laws of motion
  • Ability to apply the concept of efficiency in mechanical systems
NEXT STEPS
  • Study the principles of gravitational potential energy and its application in lifting systems
  • Learn about the relationship between force, velocity, and power in mechanical systems
  • Explore the concept of efficiency in electrical motors and how to calculate it
  • Investigate the impact of varying load conditions on motor efficiency
USEFUL FOR

Students in physics or engineering courses, mechanical engineers, and anyone interested in understanding motor efficiency and energy transfer in lifting systems.

  • #31
malemdk said:
Rate of change of potential energy d(mgh)/dt =mg dh/dt = mg x v = Fx v = power needed to maintain the constant velocity, where from you can find efficiency if you know the input power
The fact that you used d(mgh)/dt confuses me, since we don't do that, and you put it on one line.
 
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  • #32
sorry
 
  • #33
TomHart said:
Just one minor issue. The voltage was 3.0 V.
yes
 
  • #34
IDK10 said:
The fact that you used d(mgh)/dt confuses me, since we don't do that, and you put it on one line.
Are you familiar with the equation Power = Force x Velocity?
 
  • #35
Yes , I designed many ,many machines using this equation .
it can be derived from Newtons second law
 
  • #36
malemdk said:
Yes , I designed many ,many machines using this equation .
I was asking @IDK10. He seemed to be having trouble understanding your solution.
 
  • #37
ok
 

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