15 Apr '14 14:451 edit

http://phys.org/news/2014-04-cern-world-record-current-superconductor.html

This piece is showing 20,000 amperes going through this 20 meter cable.

My question: A superconductor has zero resistance and the usual way you calculate power is to multiply current times voltage which gives you an answer in watts, or joule/seconds. So if you just do the math you go 20,000 times zero which of course is zero.

So how do you figure out how much power they are talking about in these cables? How many watts are transmitted?

Maybe you have to calculate using the number of electrons passing a point in a given time. Don't know how to do that however.

This piece is showing 20,000 amperes going through this 20 meter cable.

My question: A superconductor has zero resistance and the usual way you calculate power is to multiply current times voltage which gives you an answer in watts, or joule/seconds. So if you just do the math you go 20,000 times zero which of course is zero.

So how do you figure out how much power they are talking about in these cables? How many watts are transmitted?

Maybe you have to calculate using the number of electrons passing a point in a given time. Don't know how to do that however.