Why the efficiency of an engine cannot be 100%?

2 answers:

6 0

<span>No machine can operate at 100 percent efficiency because some of the energy input will always be used to overcome the force of gravity and the effects of friction and air resistance.</span>

Alex73 [517]3 years ago

3 0

No, because the engine can't convert enough heat. 100%? That's way too much. That is theoretically impossible. Its important to consider the equation, this will give you the better picture as to why it can't be. In fact, the maximum efficiency CANNOT be more than the Carnot limit. Its the 2nd Law of Thermodynamics.
nth ≤ 1 - (Tc/Th)

I hope this helped.

You might be interested in

A steam turbine operates at a boiler temperature of 450 k and an exhaust temperature of 300 k. what is the maximum theoretical e

Helga [31]

The maximum theoretical efficiency of the system is the one corresponding to the efficiency of a Carnot cycle operating between the same temperatures of the system:
$\eta=1- \frac{T_c}{T_h}$
where $T_c$ and $T_h$ are the cold and hot temperatures, respectively.
In our problem, $T_c=300 K$ and $T_h=450 K$ , therefore the maximum theoretical efficiency is
$\eta=1- \frac{300 K}{450 K}=0.33$
So, 33%.

5 0

3 years ago

Question : Is it possible for heat to transfer from T3 to T1 and why?

fomenos

Answer:

no its a negative

Explanation:

because they both are positive

6 0

4 years ago

A star with a mass like the Sun which will soon die is observed to be surrounded by a large amount of dust and gas -- all materi

Dafna11 [192]