All Questions
Tagged with electric-circuits work
33
questions
0
votes
2
answers
54
views
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 ...
- 207k
0
votes
3
answers
169
views
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 ...
- 28.1k
1
vote
2
answers
162
views
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 ...
- 73.7k
2
votes
5
answers
611
views
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 ...
- 629
1
vote
2
answers
256
views
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 ...
- 8,142
1
vote
2
answers
117
views
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(...
- 755
9
votes
4
answers
5k
views
Work done by magnetic field on current carrying conductor
Suppose a wire of length L carrying a current I is kept in a uniform magnetic field B perpendicular to the current. The force on the wire will be IBL and work done by magnetic force when wire moves a ...
- 39k
0
votes
1
answer
214
views
Energy stored in a capacitor vs Work that the battery does [duplicate]
Say we have a battery at a fixed voltage of $V$ charging a capacitor with capacitance $C$.
When the capacitor is fully charged, the energy stored in it will be $\frac{1}{2}QV$, where $V$ is the final ...
- 207k
0
votes
1
answer
99
views
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 ...
- 207k
9
votes
10
answers
6k
views
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 ...
- 20.6k
0
votes
3
answers
441
views
Work done on a battery
Consider a battery of EMF $E $ and label its positive terminal $P $ and Negative terminal $N $.
Consider current flowing through the battery from $N $ to $P $. Then work is done by the battery. This ...
CommunityBot
- 1
2
votes
2
answers
505
views
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_{...
- 60.3k
2
votes
1
answer
164
views
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 ...
- 207k
2
votes
3
answers
392
views
Electric potential in circuits
From what I understand from my notes, an e.m.f or electromotive force provided by a battery is the electrical energy per unit charge converted from other forms of energy required to drive a unit ...
CommunityBot
- 1
1
vote
2
answers
246
views
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 ...
- 778