All Questions
172
questions
1
vote
1
answer
155
views
Thevenin-Norton Conversion
Using Thévenin-Norton equivalence, prove that the circuit below
is equivalent to the circuit below
The main point behind my confusion is that the current source has no parallel resistance. As a ...
- 251
0
votes
1
answer
47
views
Does $\frac{V}I = k$ necessarily imply that the wire follows Ohm's Law?
Does $\frac{V}I = k$ necessarily imply that the wire follows Ohm's Law?
https://i.sstatic.net/ClEqP.jpg
Say, for a range of about 15 Volts, I get a good $\frac{V}I = k$ result, after which the ratio ...
- 101
0
votes
1
answer
607
views
Understanding the physical meaning and effect of voltage and current being out of sync
In alternating current, we may have inductors and capacitors which make voltage and current become out of sync.
At the beginning, I was stuck because how can it be that there is first voltage and ...
- 349
1
vote
1
answer
213
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Why aren't salt water batteries used to power cars instead of lithium-ion?
I know salt water batteries are less efficient than lithium-ion, but water is safer, can be found anywhere, is cheap and 100% ecological. Even if it doesn't last long, you can refill anywhere. Why can'...
- 1,029
0
votes
2
answers
90
views
Relationship between current and voltage (I know little physics)
I'm a little confused about the relationship between voltage, current and resistance. I do know V=IR; but as to the relationship between voltage and current- (holding resistance to be constant) does a ...
- 21
2
votes
1
answer
635
views
Is the current on one side of the bulb more than the current on the other side of it?
Go easy on me if you find this question stupid, just another high schooler here.
So here's what I am thinking.A battery "pushes" electrons through a circuit due to the electric potential difference ...
- 1,033
2
votes
3
answers
1k
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Why does current remain constant in a series circuit although the rate at which they flow deceases due to the collisions they go through? [duplicate]
I am really confused and frustrated as I can't figure this out. If someone could clear my doubt, I'd be really thankful.
According to my textbook current is the rate of flow of charge, it is ...
- 35
1
vote
2
answers
560
views
Conservation & Flow of Energy in Circuits
Before I ask my question, it's important that you know how I understand the underlying physics of circuits, so you could point out any misunderstandings or incomplete thoughts. A battery creates an ...
- 43
2
votes
1
answer
272
views
Confusion on negative charges, current, and direction
My text book seems to have two contradictory statements about the same subject. Under the electrical potential and capacitance chapter, it says that negative charges move from lower to higher ...
- 217
13
votes
5
answers
4k
views
Watts vs. volts amperes
What I understand:
In simple DC circuits, this is a product of the current and voltage, such that 1 watt = 1 ampere x 1 volt
I understand that a watt is a unit of power (change in energy per unit ...
- 329
1
vote
2
answers
47
views
What is the Electron Flow in a wire with 2 power sources 180 out of phase?
If you took two independent power supplies and set them to a sine with each power 180 degrees out of phase. The powers supplies will share a common line and the load will be equal_____________?
Do ...
- 11
0
votes
2
answers
1k
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What happens when very high resistance is connected parallel to low resistance
What happens when a resistor of very high resistance (say $10,000\ \Omega $) is connected in parallel with a resistor of comparatively lower resistance of about (say $100\ \Omega $)?
Is the overall ...
3
votes
7
answers
5k
views
Why is high voltage dangerous?
High $V$ low $A$ electricity is transformed into low $V$ high $A$ through a step down transformer for safer use in homes.
But how is it any safer? The wattage is the same for the pre-transformer ...
- 1,821
9
votes
3
answers
8k
views
When the voltage is increased does the speed of electrons increase or does the electron density increase?
I am just a high school student trying to self study, please excuse me if this question sounds silly to you.
I know that current is a product of the speed of electrons and the electron density.When ...
- 1,033
1
vote
3
answers
3k
views
Why is the current same after and before passing through a resistor? [closed]
•Why is the current same after and before passing through the resistor ?
•Why is a voltage drop across the resistor ?
Explanation in terms of electron flow and electric field will be really helpful.
...
