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# Tag Info

## Hot answers tagged electric-circuits

4 votes
Accepted

### Potential difference when two emf sources are connected in a simple loop circuit

What you have to remember is that for a resistor the current always flows from one node to another at a lower potential. Thus when the current trough a cell is reversed (the difference between a cell ...
• 97.8k
3 votes

### Why electric field increase near the cable connected in AC 220V socket even current is zero?

The electric field depends on the potential difference (voltage) between the wires in the cable, not on the current going through the wires. The electric field will be strongest inside the cable, ...
• 36k
2 votes
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### Doubts in circuit analysis

Maybe I am loosing some detail here, but assuming that all resistances are equal, and looking at the symmetry of the circuit, all dpps and currents should be the same in module if you flip the circuit ...
• 130
2 votes

### Why is my idea of voltage drop wrong?

To simplify matters, assume that the mobile charged particles under consideration are positive and ignore the thermal motion of the charged particles. I am going to compare the motion of a charged ...
• 97.8k
2 votes

### Why is my idea of voltage drop wrong?

Voltage drop means voltage loss, typically in the context of electrical current flowing through a series of resistors or a piece of resistive wire. Let's say we have a loop of resistive wire leading ...
• 95.3k
1 vote

### Circuit quantization procedure

Josephson junction can be considered classically in the regime when quantum fluctuations of the superconductor phase are small. In this case, it is simply a circuit element with a phase-current ...
• 1,011
1 vote
Accepted

### How can I deduce a capacitance of a capacitor without existing formulaes?

Since you are assuming $k$ is a constant, you can take it outside of your integral formula to give $V(t) = k \int_0^t r \space dt$ But $\int_0^t r \space dt$ is the charge $Q(t)$ that has accumulated ...
• 56.1k
1 vote
Accepted

### Visualization of resistance

What does a resistor do in an electrical circuit? The resistance of a conductor limits the amount of current that can flow in the conductor for a given potential difference. I have been told to ...
• 73.5k
1 vote

### Visualization of resistance

I have been told to think of water flowing in a pipe and which has a narrow part I don't think the narrow pipe is a good analogy of a resistor. In simple fluid dynamics the water in the narrow part ...
• 56.1k
1 vote

### Confusing definitions of EMF

The formal definition of the electromotive force can be written as follows. $$\mathscr{E} = \sum_{i} \int_{L} \mathbf {f_i} \cdot d\mathbf{l}$$ Where $\mathbf{f_i}$ is the ...
1 vote
Accepted

### How do conductors actually work in electrostatics?

There are different kinds of conductors. The common thing is charges are free to move around. Metals are a common example. In a metal, some electrons do not stay in orbitals around individual atoms. ...
• 40.7k
1 vote

### Confusion regarding phase

Yes, your understanding of phase difference is correct: if the phase difference between two waves is positive, the former is leading and the latter is lagging. Let's closely examine what Griffiths is ...
1 vote

### Working of batteries and supply of charges through them when connected to capacitors

You: is there any new charge coming out of the battery? Ans: No new charge can't come out. The total charge of the whole system will be constant (conservation of charge). Simply you can think some ...
1 vote

### Working of batteries and supply of charges through them when connected to capacitors

Note that the net charge on the combination of both plates is +60 Coulombs both before and after being connected to the battery. So the battery has not "supplied" any charge. It has just “...
• 73.5k
1 vote

### Weird looking sine wave behavior in an electric circuit

With competent values that you have given and assuming that the voltage source has little or no resistance then $Q=10$ and the resonant frequency is $\approx 36\,\rm kHz$. As the $Q$ value is ...
• 97.8k
1 vote

### Cannot catch a minus sign mistake when deriving the ODE for an LC circuit

You're using opposite sign conventions for the potential differences across the capacitor and the inductor. Arbitrarily designate one terminal of the capacitor as $C_{in}$ and the other one as \$C_{out}...
• 1,220

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