A copper bus bar is subject to a short circuit current of 500 A for 10 s. The section of the bus bar, through which the current flows, has a length L = 50 mm and a cross section of A = 20 mm^2. Approximate the thermal energy released in the bus bar due to the current, assuming a resistivity for copper of 1.7 x 10^-8 Ohm*m. Give your answer in Joules. Assume the same copper bus bar as in the previous question, which now has a total mass of m = 150 g. During the short circuit 405 J of energy are released. Approximate the average temperature increase of the bus bar in degrees Celsius [°C] using appropriate assumptions. Please state the assumptions you made.
3
-
$\begingroup$ We might look at homework IF you have made a valid attempt, otherwise VTC. $\endgroup$– Solar MikeCommented Jun 4 at 18:51
-
$\begingroup$ I assume you haven't tried anything yet. This is simple i-squared-r stuff plus heat capacity. Also I've never had a homework problem where the text didn't explain the concepts already. $\endgroup$– Tiger GuyCommented Jun 4 at 21:53
-
$\begingroup$ Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. $\endgroup$– Community BotCommented Jun 10 at 12:21
Add a comment
|