All Questions
Tagged with electricity electric-current
791
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Current by change in position of charges
I have been thinking about the idea given below
Consider the following situation
I have a rod which has a mass $m$ and hence does have the virtue to perform work against the gravitational field of ...
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1
answer
33
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Analysis of Current for infinitesimal time
Suppose we have a hydrogen atom and electron is revolving in a orbit around the nucleus. We have to find current due to the revolving electron.
Current = ev / 2πr
( e = charge of electron)
( v = ...
- 109
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37
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Mobility (Current Electricity)
I was reading mobility in current electricity and there it was written that the direction of conventional current due to positive and negative current carriers is in the same direction but I cannot ...
2
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2
answers
127
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Is it necessary for circuit to be closed in order for current to flow?
In case of earthing, we attach a single wire to the earth and if some residual electrons remain in the instrument they flow to the earth until the potential of the instrument also becomes Zero. So if ...
- 187
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56
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Moving charges in a circuit [duplicate]
Current flow from positive to negative terminal in a circuit. But the charges which are moving in the circuit are the electron that is moving from the negative terminal to the positive terminal. Why ...
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2
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56
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Current in a two capacitors system in parrallel
I solved this question and I got the values of charges on capacitors in figure B. But my question is charge on capacitors is getting redistributed,but how is it possible when potential difference ...
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27
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Can you measure different currents at different contact points for a volume of material made of two different metals with different conductivities?
My question is about the variation of conductivity in a volume of material and its effect on measured current. A volume is comprised of two metals joined symmetrically in a cuboid shape as in the ...
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2
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181
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Explanation of Potential Difference
My question is to verify if my thought process below is correct.
So in a circuit the charge will flow (the current). When the charge flows there is resistance which is the collisions of the charge ...
- 37
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1
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68
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Current flow with no resistance
Imagine a simple circuit consisting of a battery with potential $V$ connected to a resistor with resistance $R$ by a loop of copper wire with $0$ resistance. It is obvious that a current $I=\frac VR$ ...
- 366
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2
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201
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Does current flow equally through the cross section of a wire in DC?
(Most Probably a duplicate, but I couldn't find it)
I have heard about 'Skin Effect' in AC, but currently Im only and only concerned about DC.
When current flows in simple DC circuit, does the current ...
- 1,305
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119
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Why won't the bulb light? [closed]
Here's what the marking scheme says: "Capacitor gets charged first and acts as an insulator/blocks current".
However, electrons flow from negative to positive, so shouldn't the electrons ...
- 93
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2
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91
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Energy conversions in Electric furnace
Heating furnaces use eddy current to work, but I have a problem understanding something, what are the energy conversions that happen in the electric furnace? Is it magnetic->electric->thermal or ...
- 17
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126
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Effect of solenoid on iron core in ac and dc circuit [closed]
If i have 2 insulated coils and i wrap each one of them on a iron core (i have 2 seperate ciruits) if i add a dc source “battery” in the first circuit and an ac source in the second circuit would ...
- 17
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3
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99
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Potential drop against internal resistance of cells in combination
Suppose two cells of emf and internal resistance e1, r1 and e2, r2 respectively are connected in series. The negative electrode of 1st cell is connected to negative electrode of the second cell. Why ...
- 1
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2
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76
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WIll maintaining the ratio of 'Voltage/Resistance' violate Ohm's Law?
In an ohmic conductor if voltage and resistance are increased in a constant ratio, the current will remain same and if it remains same, won't it violate the Ohm's Law?
As because Ohm's Law states '...
