Question

why does the polarity of the electrons change periodically in ac current?
arity of electrons change periodically in ac current?

Answer 1

Answer:nueton are positive

Explanation:

Protons are negative

Answer 2

Answer:

Direct current cannot flow through some electric components, such as capacitors and transformers. The constantly reversing polarity of an AC signal can enable you to use these components to block DC power from entering one part of an electrical circuit. Since a transformer is made of two inductors wrapped around a common core, a transformer will be able to step up or step down only an AC signal, not DC power.