Heat Engine - Maximum Efficiency

[science.girl]

Homework Statement

A heat engine operates between a reservoir at 25 degrees Celsius and one at 375 degrees Celsius. What is the maximum efficiency possible for this engine?

Homework Equations

e = $$\frac{Q_c}{Q_h}$$

The Attempt at a Solution

I'm afraid that the equation above requires units in Joules to calculate thermal efficiency. Is there an equation adapted for this situation? Or does this require more figuring?

 

[Thaakisfox]

Just a little more figuring ;) think of the Carnot cycle ;)

 

[Redbelly98]

Check your textbook for another efficiency equation, one involving absolute temperatures rather than Q's.

 

[Andrew Mason]

Homework Statement

A heat engine operates between a reservoir at 25 degrees Celsius and one at 375 degrees Celsius. What is the maximum efficiency possible for this engine?

Homework Equations

e = $$\frac{Q_c}{Q_h}$$

Efficiency is the ratio of Energy (work) out to Energy (heat flow) in. This is not Q_c/Q_h

AM