Power Problem regarding elavator

[Ethan_Tab]

Homework Statement

An 255kg elevator which is 62.5% efficient climbs 52.5 meters in 25 seconds. What is the power required to do this.

I'm just not sure how to incorporate efficiency in this.

Homework Equations

P= change in energy over change in time
GPE=mgh

The Attempt at a Solution

P= 255*9.81*52.5/25 Do I need to multiplay the numerator by 0.625? Could you please explain why or why not? Thanks in advance :)

 

[billy_joule]

Will a non ideal process (<100%) require more or less energy than an ideal process?

 

[Ethan_Tab]

Will a non ideal process (<100%) require more or less energy than an ideal process?

More. would I have to multiplay it by 1.625 then?

 

[billy_joule]

No. 1/1.625 = 0.615 ≠ 0.625