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The study of the presence and flow of electric charge. Charges, currents, fields, potentials.

1
vote
2answers
Consider the situation when a cell of an unknown emf is being measured using a potentiometer. We slide the jockey so as to obtain the null point. Now, is there any current in the potentiometer wire at …
asked May 14 '14 by Swami
12
votes
7answers
People say yes, and give a wonderful example of vacuum tubes, CRTs. But can we really say that vacuum (..as in space) is a good conductor of electricity in a very basic sense? …
asked Apr 28 '15 by Swami
1
vote
1answer
Generally, the electric connections at home are in parallel combination. How is it possible for a geyser(220 Volts) and a cellphone charger (5 volts) to operate at different voltages in a parallel com …
asked Jun 17 '15 by Swami
37
votes
5answers
Since the Earth is a good conductor of electricity, is it safe to assume that any charge that flows down to the Earth must be redistributed into the Earth in and along all directions? Does this also …
asked Mar 29 '15 by Swami