All Questions
Tagged with electricity electric-current
791
questions
5
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3
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1k
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Charge signs in current
I've had recently an argument with my friend about different charge carriers in an electric current. Suppose that electrons and holes are moving in the same direction. It effectively means we have ...
- 283
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2
answers
21k
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Electron flow and electric potential
In the physics tutorial topic on current electricity it defines the positive terminal as the high potential terminal and the negative as the low potential. When talking about positive test charges ...
user36405
0
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3
answers
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How do voltage and voltage drops over a circuit relate to work done?
I have a few remaining uncertainties when it comes to voltage. I numbered the paragraphs in my thought sequence for easier reference.
In a series circuit, I know voltage is the electric potential, ...
- 909
7
votes
3
answers
21k
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Questions about voltage
For some reason, I feel like the concept of voltage is escaping my grasp. I've done much research on these forums and through texts, and come across answers that seem quite well thought out, but still ...
- 909
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2
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Transmit DC power with one cord?
My DC devices have two wires connecting them to the power source, but what would be needed to transfer DC power using just one? I depict it as a kind of headphone, which can work with just one wire.
- 398
2
votes
3
answers
376
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Relation between voltage and current [duplicate]
What I know is that voltage is the electrical pressure which is required to drive the electrons in a circuit. According to that we have higher currents when there is a high voltage. Ohm's law confirms ...
- 121
0
votes
2
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523
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Voltage and current in parallel circuit
I am having a bit of a tough time understanding the following:
...
- 257
7
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2
answers
22k
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How do stun guns not kill people?
Now, I've seen a lot of answers to this sort of question, but most of them provide answers that don't actually make sense from a physics perspective.
As an example of such an answer, I've commonly ...
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3
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3k
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Current without voltage?
Suppose you have a 120 volt, 20 amp circuit which only has a light bulb connected. When measuring the voltage going to the light bulb my meter reads 120 volts. The basics taught me that a circuit is ...
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1
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How to evaluate, how much current flows in the circuit?
Please take into advisement, that I'm quite a beginner in subjects of physics and especially about electricity. Lately I've decided, that I want to learn more on basics of electronics and I've started ...
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4
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6k
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How can there be a current and an electric field in an idealized wire with no voltage drop?
In an ideal circuit, How can there be a current b/w points a & b, when there is no potential difference and thus no electric field between a & b? If there is no current, then where does ...
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3
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Why is it written 'High voltage' in danger boards if current is the one which actually causes the shock?
After reading the answers given to this question I could understand that the amount of shock is dependent on the current and not majorly on the voltage even-though in some cases it depends.
But, in ...
- 3,905
3
votes
2
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114
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Direct current and metallic conduction
Suppose we have a circuit with and EMF source and a resistor. We know that when electron moves from one terminal of a voltage source to another it encounters resistance, which is basically collisions ...
- 481
3
votes
2
answers
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How does an electric field come inside a conducting wire inside the circuit? [duplicate]
This has been a really great confusion for me now ....
Many places I have read in books that when a potential difference is applied across the ends of a wire a constant electric field is generated ...
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3
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Why current through all the resistors in series is considered to be same? [duplicate]
Consider the circuit shown, where $R_{1} > R_{2}$. I meant to say that resistance offered by the resistor 1 is greater than the resistance offered by the resistor 2. Keep $t$ constant i,e calculate ...