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

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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
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$n$ 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
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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
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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
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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
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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
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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
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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
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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
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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
2
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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
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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
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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
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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
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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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