2
$\begingroup$

How to convert Joules(kinetic energy) plot chart into watts? Anyone know how?enter image description here

$\endgroup$
7
  • 1
    $\begingroup$ Watts are Joules per second, so area under the curve. $\endgroup$
    – Solar Mike
    Oct 4 '18 at 3:24
  • 3
    $\begingroup$ @SolarMike But the area under the curve would give Joules times seconds, which seems a meaningless quantity. Using the slope of the curve would be better! $\endgroup$
    – alephzero
    Oct 4 '18 at 8:28
  • $\begingroup$ Why you don't plot it in Watts? Solidworks does plot in Watts. $\endgroup$ Oct 4 '18 at 10:31
  • 2
    $\begingroup$ @SolarMike I think you're thinking of the other way around. To get total energy from a power plot you just integrate. $\endgroup$
    – JMac
    Oct 4 '18 at 14:36
  • $\begingroup$ Yeah; the differential is tan( angle of the curve ) or rise rate. $\endgroup$
    – SF.
    Oct 5 '18 at 12:33
5
$\begingroup$

To convert a plot of J versus s to a plot of J/s vs s, take the derivative.

Here is my quick-and-dirty answer after digitizing the data.

derivative plot

$\endgroup$
3
  • $\begingroup$ What software package[s] did you use here? $\endgroup$ Oct 4 '18 at 22:23
  • 1
    $\begingroup$ IgorThief in Igor Pro. WaveMetrics.com. When I would have the raw data rather than image, this would be a direct one-step process that would be accurate rather than rough. $\endgroup$ Oct 4 '18 at 22:51
  • 1
    $\begingroup$ @Chemomechanics my favorite tool for digitizing graphs is DataThief. It's like magic. $\endgroup$ Oct 5 '18 at 16:53

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.