Show the power in ltspice

Discussion in 'General Electronics Chat' started by Soma23, Apr 24, 2015.

  1. Soma23

    Thread Starter Member

    Apr 24, 2015
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    Hi i have drawn this circuit ; consists of ac power supply and 1 k resister with ground but i want to show the power consumption could someone help me please
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Run the sim, place the cursor over the component whose power you want to measure, press and hold the Alt key (cursor symbol becomes a thermometer), left-click to plot power.
     
  3. crutschow

    Expert

    Mar 14, 2008
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    After doing a transient simulation, place the cursor over the component for the power measurement, hold the ALT key, and left click.
    The will display a graph of the power dissipated over the simulation time.

    To get the average power over that period, place the cursor over the title for the power graph, hold the CTRL key, and left click.
    Note that if you want the average power of a periodic wave, then you need to display an integral number of complete cycles.

    Edit: Alec beat me to the punch.
     
  4. Soma23

    Thread Starter Member

    Apr 24, 2015
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    From where i can do transient simulation ?
     
  5. Soma23

    Thread Starter Member

    Apr 24, 2015
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    I got the current not the power
     
  6. Soma23

    Thread Starter Member

    Apr 24, 2015
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    I got the power but it is 0 all thetime why ?
     
  7. Soma23

    Thread Starter Member

    Apr 24, 2015
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    When i drew a circuit in spice which consists of 1k resister , ground , and ac power supply i got the power is 0 all the time why ?
     
  8. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    Post the circuit file so we can take a look at it
     
  9. Soma23

    Thread Starter Member

    Apr 24, 2015
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    I tried but it didn't uploaded
     
  10. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    is it a .asc file that you tried to upload and failed? Or is it some kind of image?
     
  11. Papabravo

    Expert

    Feb 24, 2006
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    What is the average voltage over one cycle of a sinewave with a resistive load? Zero.
    What is the average current over one cycle of a sinewave with a resistive load? Zero.
    You need to find RMS voltage times RMS current. That is the number you want.
     
  12. Soma23

    Thread Starter Member

    Apr 24, 2015
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    No i took a picture of it jpeg file
     
  13. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    :confused: and here I am asking for graphics and stuff... I forgot the KISS it rule... :mad:
     
  14. Soma23

    Thread Starter Member

    Apr 24, 2015
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    Yes that is what i want but why it is 0 ?
     
  15. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    Soma, you're posting to two threads simultaneously on the same subject. I suggest you stick to only one
     
  16. OBW0549

    Well-Known Member

    Mar 2, 2015
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    Three threads. :rolleyes:
     
  17. Soma23

    Thread Starter Member

    Apr 24, 2015
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    Ok sorry i thought that it didn't post the pervious one
     
  18. Papabravo

    Expert

    Feb 24, 2006
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    You're right to ask for the graphics and stuff. The TS is struggling to understand what is going on and I sympathize with his dilemma. One of the posts in the previous thread asked if he was interested in instantaneous power or average power and these relevant questions were never precisely answered in my mind at least. Many people stumble over this conundrum.

    In case the acronym RMS is unfamiliar to you, it stands for Root Mean Square. It describes a process where you take a periodic signal, like a sinewave, you square it, you compute the mean (average) of the squared signal, and then you take the square root of that number. For a sinewave it is the peak voltage divided by the square root of 2, which is 1.414..., approximately.
     
  19. Soma23

    Thread Starter Member

    Apr 24, 2015
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    Could someone help me pleeease
     
  20. WBahn

    Moderator

    Mar 31, 2012
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    MOD NOTE: Both threads on this topic have been merged.
     
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