All Questions
Tagged with electric-circuits work
33
questions
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2
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52
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Do we have to provide energy to move electrons in an electric field?
In the positive and negative terminal of a battery, there is potential difference due to the accumulation of charges in their respective terminal, so it created a potential difference, and if we ...
0
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3
answers
162
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Why is Power in an electric circuit equal to $VI$? [closed]
Where did this formula come from? Everyone I asked just told me to substitute values of in ohms law to derive this but no one told why is power equal to voltage * current. Part of the reason for this ...
- 9
1
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2
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161
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What's the necessary work to increase the distance between two plates of a capacitor connected to a battery?
I'm trying to understand what happens, when the capacity of a capacitor connected to a battery changes.
I have this circuit formed by a battery that provides a potential difference of $\Delta V$ and a ...
- 435
2
votes
5
answers
608
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Can we use work equation to derive Ohm's law?
Ohm's law states:
$$\textbf V=\textbf I\cdot\text R$$
where $\textbf V$ is voltage, the electric potential difference from a point to another (Electric potential is the potential energy of a positive ...
- 213
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2
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256
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Work-energy theorem giving no work done on capacitor and dielectric when dielectric removed from capacitor [closed]
For this problem,
Do you please know why when considering that the capacitor and dielectric is our system, the work energy theorem gives the wrong sign for the change in electrostatic potential ...
- 49
1
vote
2
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117
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Working of battery in circuit
The battery has a potential difference. So, shouldn't battery generate an electric field directing from the positive side to the negative side? If that's the case, we know that potential in a wire(...
- 1,179
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1
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99
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Work done by battery [closed]
In charging a capacitor to a charge $Q$
Is there an equivalent to this in setting up current through an inductive circuit?
Energy stored in inductor $= 1/2Li^2$
What would be the work done in setting ...
- 3
9
votes
10
answers
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Why is Power = Voltage $\times$ Current?
So P = I*V because V is the amount of energy per coulomb and I is the amount of electrons going past a cross sectional area in one second.
So if we do the math, since V = J/C and I = C/sec, if we ...
- 191
2
votes
1
answer
164
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Does a CPU do work?
This question is simple to the Core (excuse the pun).
CPU = Central Processing Unit (for computing)
Lots of people including myself say "My CPU is doing a lot of work."
But I do not think ...
- 121
1
vote
2
answers
245
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What happens to electrons when they do work across a component in a circuit?
When a current flows through a component such as a lightbulb, how is work done?
I was thinking it was the speed of the electrons and that after a current goes through a lightbulb the electrons in the ...
0
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5
answers
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What's the Difference Between Work and Energy? [duplicate]
I was trying to derive the formula $P = IV$, and I figured out to start from the basis that power is just work divided by time. In this case, I thought that I could use the formula $Vq = PE$ and ...
- 761
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78
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Can someone please explain the work of a resistor?
Well I want to know what does a resistor do let our electrical appliances from burning in a circuit I know it does not slow the current flow so what does it really do?
- 11
2
votes
2
answers
501
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Sign of work done in an $L$-$R$ circuit
Suppose we have a L-R circuit with an inductor of inductance $L$ and resistance $R$ and emf $\epsilon$. Now initially when the switch is closed no current is present. Let the maximum current be $I_{...
- 159
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3
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184
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Neutral points in an electrical circuit?
I have been told that potential in an electric circuit is defined as the work done in bringing a unit test positive charge to that point inside the circuit. Thus it satisfies the premise that ...
3
votes
4
answers
379
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Voltage as work in electric field and in Ohm's law
I am struggling to reconcile the definition of voltage as work done moving a unit of electric charge between two points in an electric field and voltage in Ohm's law.
In the work definition, ...
- 155