# Questions tagged [short-circuits]

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### How exactly does an inductor behave in a circuit after reaching its steady state?

I was solving this question in my coursebook and was not able to understand it conceptually. Though I did understand the mathematical approach to it. Now I understand that when the rod is given an ...
599 views

### Why does a short circuit occur? [duplicate]

For example, if you have a battery and you connect both ends with a short circuit with zero or low resistance, why does it short circuit? What causes this internally? What are really happening with ...
37 views

### Doubt about short circuit [duplicate]

I have been asked to find the equivalent resistance in the following circuit. However, is the circuit valid, as a zero resistance wire is connected between 2 different potentials? Also, how to ...
45 views

### Are short circuits a type of parallel circuit?

Since short circuits have >1 electrical pathways for current to flow, the unintended and intended pathway, I would assume that short circuits are parallel circuits and therefore current is ...
1 vote
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### Short circuit doubt [duplicate]

Short circuits occur when a live wire comes in contact with a neutral wire due to poor insulation and stuff, and the main gist of this word short circuit is the fact that the wire gets heated up so ...
1 vote
31 views

### Short circuit on one branch of parallel connection [closed]

I don't understand how that extra branch that starts in (a) affects the circuit. If R4 did not exist, then r2 and r3 would be ignored but now you have to take into account the (b) knot. How can we ...
60 views

### Why short circuit doesn't takes places in a homopolar motor?

In a homopolar motor we directly connect copper wire to a battery without any resistance with a magnet in bottom, so why doesn't a short circuit takes place?
61 views

### KVL in short circuit with 0 resistance [duplicate]

According to KVL, $\sum \epsilon = \sum RI$ in any closed loop. However, in an ideal circuit with no resistance, R is $0$, and hence $\epsilon$ must also be $0$. Does KVL not apply in this case?
1 vote
783 views

### How does earthing a conductor make its potential zero?

My teacher explained about earthing of a conductor. She said that when we connect a conductor with Earth, its potential goes to zero, because the Earth always has zero potential; however, she never ...
106 views

Imagine that you has a large electric potential difference across two parallel branch's in a circuit. One branch has zero electric resistance, and the other branch has a load such as resistor. Which ... 303 views

### Why dose current only take the path of zero resistance in a parallel circuit?

If a resistor in placed in parallel with a wire of zero resistance the current only flows though the path of zero resistance. What stops the the current from flowing thought the resistor? Also how do ... 435 views

### Will I get a shock holding a superconductive wire?

Assume a current carrying superconductive wire is in front of me, with no voltage source attached. If I hold it, will I get a shock? Forget for a minute that the superconducting wire will be too cold ...
1 vote
87 views

### A simple question about parallel connecting a short circuit (+the physical interpretation)

1. Introduction We know that $$1/R_1 + 1/R_2 = 1/R_t \ (equation \ 1)$$ $$\therefore R_t = \frac{R_1\times R_2}{R_1+R_2} \ (equation \ 2)$$ when $R_1$ and $R_2$ are connected in parallel and $R_t$ is ...
42 views

### What does it mean to ground in this context?

This is a homework problem that I already submitted, but am still unsure about. I am consider the following situation, re we have a conducting sphere of radius $R$ with charge $q$, which is surrounded ...
154 views

### Is the eigenvalue of an eigenstate the same as its (global) phase?

I'm trying to understand Shor's Algorithm by reading this Qiskit textbook. At some part the following equation comes up: \begin{equation} U |u_0\rangle = \frac{1}{\sqrt{12}} \begin{pmatrix} |3\rangle +...
1k views

### Why can you shortcircuit a car battery with a wrench in your hand and stay safe?

In this demonstration by Prof. Walter Lewin a car battery is shortcircuited with a wrench. The experimenter is holding the wrench in its bare hands, so why he is not experiences an electric shock? ...
1 vote
142 views

### Kirchhoff’s Voltage Law validity in short circuited circuit

Imagine a circuit with a battery and a resistor. Now I connect a resistance-less wire in parallel with the resistor. There will be a potential difference between the two ends of resistor, so current ...
151 views

### A problem with the path of least resistance

I have a question about short circuits that I haven't been able to solve. From this we know: The total voltage V is constant, and the total current I is inversely proportional to the total resistance ...
1k views

### Can grounding wrist prevent electrical shock?

Today while repairing some electronics and wearing anti-static wristband like on picture below I got thinking - in theory, would it be possible to avoid shock while working on mains by grounding ...
47 views

### Magnetic rail problem with inductor and battery (resistance less)

A metallic rod (negligible resistance) can slide frictionlessly on two parallel metallic rails separated by a distance l in the presence of a perpendicular magnetic field (B). The ends of the rails ...
1 vote
344 views

### Earthing vs. grounding

In some websites they say there is a difference between Earthing and grounding but some of them say they don't. Is there any difference between "Earthing" and "grounding"?
1 vote
106 views

### Voltage - Current Relationship (IV graphs)

This is probably a really simple question but for some reason, I'm finding it difficult to grasp at an atomic level. My physics textbook has a statement that says: "As the voltage across a ...
1 vote
228 views

5k views

### Why doesn't Kirchhoff's Law work when a battery is shorted with an ideal wire?

Kirchhoff's law states that the sum of voltages around any closed loop sum to zero. The law is true as the electric field is conservative in circuits. Why can we not apply the law here? Why doesn't ...