When n = energy efficiency and Pin = energy input and Pout = energy output, how can you mathematically represent the correct relationship between the energy you put in something and the energy you get out?

A. n = Pout * Pin
B. n = Pout / Pin
C. n = Pout - Pin

Question

When n = energy efficiency and Pin = energy input and Pout = energy output, how can you mathematically represent the correct relationship between the energy you put in something and the energy you get out?


 A. n = Pout * Pin 
 B. n = Pout / Pin 
 C. n = Pout - Pin

marco26 · Answer

B

anonymous · Answer

Why?

marco26 · Answer

I can't explain that much. I just remembered having that formula. :)

anonymous · Answer

you cant have more Pout than Pin in the system and n can be from 0 to 1

anonymous · Answer

the 1st law of thermodynamics states that energy must be conserved and not transformed to something else

anonymous · Answer

so if energy output cant exceed the input then 0<n<1

anonymous · Answer

Thank you both for helping me!