Efficiency of a Carnot engine | Thermodynamics | Physics | Khan Academy

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  • Опубліковано 22 гру 2024

КОМЕНТАРІ • 61

  • @erencan6817
    @erencan6817 6 років тому +57

    This channel will be the reason, I will graduate mechanical engineering, thanks a lot man

    • @savagegaming5024
      @savagegaming5024 4 роки тому +2

      Emmit the first comma in ur sentence bro it isn't necessary and replace your second comma with a period because it makes your grammar wrong.
      Friendly reminder :)

    • @anaysasane6186
      @anaysasane6186 4 роки тому +15

      @@savagegaming5024 I think you mean to say- 'Omit' the first comma...... "Emmit" is the wrong spelling. Friendly reminder :)

    • @francescocuccu4218
      @francescocuccu4218 3 роки тому +1

      And me in civil and environmental engineering :,DDD

    • @matthewwilliams7011
      @matthewwilliams7011 3 роки тому

      watching this now as a mech eng student with finals in 3 weeks, hope you are well

  • @David_F97
    @David_F97 8 років тому +22

    I love how he says what he is going to write and then says it again as he writes it.

  • @pfcpdh
    @pfcpdh 9 років тому +20

    Thank you so much for this video. My current professor is not as eloquent as you are, I have had epiphany after epiphany watching this video. Thank you!

  • @mohamedabdellatif9425
    @mohamedabdellatif9425 6 років тому +6

    Mr . Sal khan . after 10 years people are still learning from your videos including myself. thank you

  • @CHistrue
    @CHistrue 8 років тому

    I'm going along and doing all those Physics problems I (should have) had done as a Physics Major so long ago before I switched Majors. I don't have any Professor now in my Summer Years so I am grateful for the help Khan Academy!

  • @diegomunoz1171
    @diegomunoz1171 6 років тому +2

    Which was the lesson before this?? Just so I can watch them one by one for my Thermo Class.
    Thanks!!

  • @joetheboy04
    @joetheboy04 14 років тому +3

    Mr Khan, great work. Can you please relate efficiency to Co-efficient of performance please. Both terminologies confuse me.

  • @knownstranger2570
    @knownstranger2570 Рік тому +3

    Am i the only one watches this after 13 yrs!

  • @Rakib-us9is
    @Rakib-us9is 3 роки тому

    These videos are really helpful and you make it very easy to understand.

  • @douglasalderman2647
    @douglasalderman2647 10 років тому +1

    I can see why its 1 - T2/T1 when the gas the other side is what counters the presure from the gas before heating that makes sence. But you could get higher efficencys if it was only pushing aginst a vacume or just a gas with lower pressur at the same temprature. Its the gas that has its volume reduced thats takeing the T2/T1 of the energy in the carnot engine.

  • @devashishthapa834
    @devashishthapa834 7 років тому +2

    sir can you explain the cp and cv topics for different monoatomics,diatomics,and triatomics gases

  • @DonGuzmann
    @DonGuzmann 12 років тому +2

    So, where is this mysterious next video, this fine gentleman was speaking of?

  • @Micha-mj7vg
    @Micha-mj7vg Рік тому

    Thanks!

  • @rohanprajapati2330
    @rohanprajapati2330 10 років тому +2

    u r awesome....plz derive the equation of efficiency of carnot cycle by T-S diagram .....i will glad to see that video :)

  • @anniebit
    @anniebit 4 роки тому

    Forever grateful for you!!!!

  • @c6mas
    @c6mas 14 років тому

    khan acadamy is brilliant

  • @virginiabrown3340
    @virginiabrown3340 11 років тому

    Oh Sal my friend, I am so glad to see you again.. I thought I would never see you after DiffyQ

    • @porte_bosho
      @porte_bosho 2 роки тому

      Mr Sal Khan and you both were friends?

  • @ad2181
    @ad2181 15 років тому +1

    Sal,
    Excellent series on thermodynamics(entropy,heat engines). Can you show Thermo princples applied to the modern electric car. I believe electric cars are not so "green" when we include the total universe required to power them. Include efficiency factors from the burning of the coal at the power plant to the batteries making the wheels turn.

  • @sudharsanvj8531
    @sudharsanvj8531 8 років тому +1

    kindly let me know the video in which you have shown that (Vc/Vd)=(Vb/Va)

    • @nightmaremodeonlife
      @nightmaremodeonlife 8 років тому +1

      use adiabatic relationship for temp and volume for the adiabatic parts of the cycle and then divide

  • @revathim9534
    @revathim9534 Рік тому

    Your videos are amazing and are useful even after 14 years ... but the thing is , isn't
    du=dq+dw
    Becoz that's what I learned...

    • @SoBasicallyImRetarded
      @SoBasicallyImRetarded Рік тому

      Nope.
      dQ=dU+dW
      From first law of thermodynamics wheres,
      dq is change in heat
      du is change in internal energy
      dw is work done

    • @revathim9534
      @revathim9534 Рік тому

      @@SoBasicallyImRetarded brooo.... I double checked it, it is what I said

    • @revathim9534
      @revathim9534 Рік тому

      It is given in Google too

    • @thomasfoster1985
      @thomasfoster1985 Місяць тому

      I'm sure you've figured this out a year later, but for anyone else that reads this, there's no mistake, it's just a subtlety of whether you define W as the work done by the gas or on the gas which changes the sign.

  • @asdfghjkl13069
    @asdfghjkl13069 13 років тому

    VERY GOOD. THANKS YOU VERYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY SD

  • @sciencenerd7639
    @sciencenerd7639 3 роки тому

    very nice

  • @JimiToBabel
    @JimiToBabel 15 років тому

    Carnot engine powering your lawn mower, that made me laugh for some reason. Great video.

  • @uriel_khan8115
    @uriel_khan8115 7 років тому +2

    Does Sal Khan always voice his Khan Academy videos?

    • @kedonsiemen
      @kedonsiemen 6 років тому

      No, for example in video "Buffer capacity | Buffers, titrations, and solubility equilibria"

  • @Kamira22289
    @Kamira22289 Місяць тому

    12:40 i did not get it

  • @nin10dorox
    @nin10dorox 5 років тому

    When you calculate Q1 and Q2, it looks like you're only taking into consideration the isothermic parts of the process. Why are we ignoring the adiabatic parts?

  • @vibodhj349
    @vibodhj349 5 років тому

    But why is Pressure taken as constant during the isothermal expansion? Pressure is decreasing and not constant from the graph.

    • @gabor6259
      @gabor6259 5 років тому

      You mean the integral? He substituted nRT/V for p.

    • @vibodhj349
      @vibodhj349 5 років тому

      @@gabor6259 I understood. It was a stupid question evoked because of lack of clarity about how integrals work. Thanks for replying though. The pressure value will change as the integral gets evaluated at every deltaV so its not taken as a constant.

  • @tsalapbeew
    @tsalapbeew 13 років тому +2

    i cannot find the second law of thermodynamics :((

  • @Tnoselaw
    @Tnoselaw 13 років тому

    thanks :)

  • @supreme84x
    @supreme84x 4 роки тому

    But one work is negative and the other is positive. So you have a sign flip when converting efficiency from Q to T.... where did the negative go?

  • @rushilpatel7418
    @rushilpatel7418 3 роки тому

    Only legends noticed the screeching hum from the last few videos

  • @rohanprajapati2330
    @rohanprajapati2330 10 років тому

    i think that derivation by T-S diagram is much easier than P-V diagram

  • @KingRobbStark
    @KingRobbStark 15 років тому +1

    5/5

  • @nicolesong6199
    @nicolesong6199 2 роки тому +1

    If u see a pic of Carnot he was really pretty lol. What an adorable twink legendary scientist

    • @Squishy1900
      @Squishy1900 6 місяців тому

      Just looked him up....He was adorable indeed. Sad that he died at 36..he was so young

  • @MariaMaria-wf7jl
    @MariaMaria-wf7jl 2 роки тому

    süper

  • @SapnaKumari-ip5bv
    @SapnaKumari-ip5bv 6 років тому

    Sir T2 / T1 kaise cancel Hua h, please tell me 🙏🙏

  • @user-kx3xb7dz8z
    @user-kx3xb7dz8z 4 роки тому

    💞💞💞

  • @nirbhaykumarchaubey8777
    @nirbhaykumarchaubey8777 3 роки тому

    Sir try improving hand writing!
    No offense

  • @sainder5248
    @sainder5248 7 років тому

    not car of engine