All Questions
8
questions
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 ...
- 219
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 ...
- 121
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 ...
0
votes
2
answers
79
views
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
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_{...
- 159
3
votes
4
answers
379
views
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
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 ...
- 3,075
3
votes
2
answers
1k
views
How do voltmeters measure work done over a component?
In my physics class, we were shown the picture below to measure the current and potential difference through a component. We were told that the resistance of the ammeter is as low as possible, and the ...
- 145