AC and DC Superconductivity
Do super conductors have zero resistance for both AC and
DC? What is the November 2007 (no pun) highest temperature for a
super conductor wires?
Superconductors have no resistance at all, so it's true they'll have none
for either AC or DC. However, inductance is another matter, so under the
correct conditions, AC may still have some losses.
I do not know the current (2007) highest temperatures achieved on
superconductors, so I cannot help you there.
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Update: June 2012