Questions tagged [electric-current]
A measure of the rate at which electric charge is transported (especially through a circuit), it has units of charge/time.
3,505 questions
1 vote
2 answers
154 views
Why does the battery discharge like this?
So me and my friends were doing an experiment in which we needed to discharge an 1.5V AA battery (Duracell LR6). We made a simple circuit consisting of a 1 $\Omega$ resistance and an ammeter in series ...
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0 votes
1 answer
82 views
Two AC sources on a single circuit
What if we connect two AC sources with different frequencies in parallel and in series? What will the voltage and current flowing in the circuit look like? (Short circuit will not damage the sources)
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1 vote
5 answers
150 views
Electric field around a wire
Does an electric field exist outside a non-perfect conductor wire with a constant current flowing through it? I think there might be an electric field parallel to the wire because current in the wire ...
- 507
0 votes
2 answers
79 views
Touching a conductor carrying eddy current
When we touch a conductor with eddy current flowing on it, will we get a shock? Because in my opinion there's an induced EMF due to which eddy current flows (assume the conductor is in the region ...
-1 votes
3 answers
223 views
Current Buildup in a Superconductor
Consider a superconducting element (wire/coil) connected across an ideal DC power source through a switch. How long will it take for current to build up after the switch is closed? Note: I have been ...
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7 votes
6 answers
1k views
How exactly do charged capacitors decrease current?
I recently learned about how capacitors function in electric circuits, and I came across an apparent contradiction that I wanted to ask about. On one hand, I know that as charge builds up on the ...
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1 vote
0 answers
149 views
Semiconductors and holes
Hello I am a 12th grade student preparing for Jee and just started learning about semiconductors, I wanted to ask that in pure silicon semiconductors, when a electron is released and goes into the ...
- 11
0 votes
2 answers
102 views
Electric current
I am trying to learn about electricity and how it works. I want it to make sense to me before diving to electronics. I understand that static electricity or a shock is the neutralisation of an ...
2 votes
2 answers
116 views
Potential difference across a bulb
I came across this question in DC Pandey Electricity and Magnetism: Image transcript: An electric lamp which runs at 100 V DC and consumes 10 A current is connected to AC mains at 150 V, 50 Hz cycles ...
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0 votes
2 answers
107 views
How should eddy currents in a conductive permanent magnet be treated in the Vector Potential formulation?
I am analyzing an electromagnetic system involving a permanent magnet using the magnetic vector potential A, defined by B = ∇ × A. The magnet is made of a conductive material (e.g., some grades of ...
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2 votes
2 answers
147 views
Confused about the reason why real current inside a battery flow opposite to the electric field
I've learned that the electric field points from the positive terminal (higher potential) to the negative terminal (lower potential). Since the force on an electron would be opposite to the field, ...
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3 votes
2 answers
439 views
What is really meant in physical chemistry when it is said that non-reacting ions confined to a solution can carry a steady state current?
Although the question title mentions physical chemistry I am asking this on PSE because being a physicist I may not be understanding this because of some differences in terminology or definitions and ...
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4 votes
6 answers
932 views
How is the "energy" given to electrons by a battery? [duplicate]
Studying electricity, we come across the ideas of voltage and current. Current is fairly simple to understand as its simply the rate of flow of charges in unit time. However, the cause for this ...
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2 votes
1 answer
123 views
Current density [closed]
I have a basic question: where, in this equation has disappeared $\frac{1}{2}$: $$\mathbf{j}=\frac{\hbar}{2im}(\psi^*\nabla\psi-\psi\nabla\psi^*)=\frac{\hbar}{m}Im\{\psi^*\nabla\psi\}.$$ I.e. how do I ...
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-4 votes
2 answers
174 views
If the field is directed from lower potential to higher then the direction of electric field [closed]
If the field is directed from lower potential to higher then the direction of electric field is taken to be positive or negative there is a lot of confusion, the famous unacademic site on google ...
