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An electronic system, with closed loop current flow, and relative electrical potentials present across electrical components.

1
vote
1answer
In an electric curcuit, charges (electrons e.g.) move randomly around very, very fast. When a current is set in a curcuit, the charges still move randomly, but have a drift velocity around the curcuit …
asked Jan 2 '15 by Steeven
11
votes
6answers
Current is a scalar $I$ with units of $\mathrm{[J/s]}$. It is defined as $I=\frac{\mathrm{d}Q}{\mathrm{d}t}$. Current density is a vector $\vec{J}$ (with magnitude $J$) with units of $\mathrm{[J/s/m^ …
asked Jan 2 '15 by Steeven
8
votes
4answers
I have a hard time really understanding the electric field in a complete curcuit. How is the electric field maintained throughout the wiring / the conductors from component to component? The charges …
asked Jan 2 '15 by Steeven
1
vote
1answer
Consider the picture below. An ammeter is shown to the left, a voltmeter to the right. They consist of a d'Arsonval galvanometer, which is a coil (with a pointer attached) that can rotate in a mag …
asked Jan 6 '15 by Steeven
9
votes
5answers
When two components are combined in an electric circuit, there is apart from their own resistances a contact resistance at their junction. This causes a sudden voltage drop of $V_{drop}=R_{contact}I$ …
asked Jun 21 '15 by Steeven