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Jack wrote:
Consider the most
simple circuit loop: a long wire and a
source of emf, such as the secondary
winding of a transformer. The potential
energy gained in the source is used to
accelerate free electrons between collisions
with bound atoms of the wire. It is then
thermalized. But suppose that the entire
loop is made from a semiconducting wire.
In my naive model electrons would no longer
collide with atoms. They would circulate
the loop with a constant speed if the primary
of the transformer was off. Right or wrong?
But with the transformer is working. Therefore
electrons should gain kinetic energy when the
emf is positive and loose it when it is
negative. In other words they can be accelerated,
like in a betatron. At f=100 Hz electrons are
strongly accelerated for two or three ms during
each cycle. That is sufficient to make a very
large number of round trips. Where am I wrong
this time?