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

The defining equation for a capacitor is $Q=CV_{\rm C}$ and when that equation is differentiated with respect to time one gets $\dfrac{dQ}{dt} = I = C\dfrac{dV_{\rm C}}{dt}$ So the current is proporti …
answered Jul 6 '17 by Farcher
$n$ and $e$ are properties of the material and they do not change. Suppose you do halve the area to $\frac A 2$. Think of the situation before when it was area $A$ equivalent two conductors in paralle …
answered May 9 '16 by Farcher
Just for ease let's assume that the wire, the resistor and the switch are all ohmic conductors with resistances $R_{\rm wire}, R_{\rm switch}$ and $R_{\rm resistor}$. For this circuit $12 = I(R_{\rm … answered Nov 8 '16 by Farcher For devices like battery chargers, motors and lamps the fluctuating voltage (ripple voltage) does not really matter but for a device like an audio amplifier the ripple voltage may well manifest itself … answered Jun 18 '16 by Farcher The passive sign convention which you have chosen to use is shown in the diagram below. You have put labels on circuit element$X$. The$i$label with the arrow is the current label. If the … answered Aug 22 by Farcher As they travel around a circuit the mobile charges lose electric potential energy (voltage drop), gain kinetic energy, collide with lattice ions losing kinetic energy, lose electric potential energy ( … answered Jan 28 '17 by Farcher Think of it a two graphs as shown below with the voltage and current in phase with one another. answered Dec 17 '17 by Farcher The terms hot and neutral are nothing to do with current rather they are to do with potential difference (voltage). A 220 V rms ac supply means that the potential difference between the hot wire an … answered Jan 12 by Farcher An electron inside the filament of a light bulb moves and gains kinetic energy from the local (oscillating) electric field and then collides with and gives energy to the ions in the lattice. This t … answered May 1 '18 by Farcher The voltage at across an inductor is given by$V=L\frac {dI}{dt}$so if the current is a sine function of time then the voltage will be a cosine function of time. This means that the voltage leads the … answered Aug 26 by Farcher Even if you put a superconductor across the terminals of a voltage source the current would be finite as all real voltage sources have a resistance. A circuit with a voltage source with no resistance … answered Feb 7 '16 by Farcher If the inner conducting shell is charged then the charges will reside on the outside of the inner shell as there can be no electric field inside a conducting shell. The charges on the outside of th … answered Apr 29 '16 by Farcher The$vi$characteristic of an ideal current source is shown below. Yiu will note that current stays constant and the terminal potential difference varies as necessary. answered Jul 15 by Farcher Thank you for the video reference which does not sem to be a RLC circuit. However it is an example of the use of the Thevinen equivalent circuit for maximum power transfer when$R_{\text{Thevinen}} = …
answered Sep 9 '16 by Farcher
The important clues are the direction of the current, the $+$ and $-$ signs on the capacitor and the orientation of the battery symbol. Stating at node b and passing through the battery there is a …
answered Apr 2 '18 by Farcher

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