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Questions tagged [short-circuits]

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1answer
54 views

Shouldn't there be short circuit everywhere?

Live wire and neutral wire should never come in contact otherwise there will be a short circuit... but when we take a two pin plug and insert it into the socket then at that time we don't see whether ...
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1answer
37 views

is this the reason why current doesn't flow over a resistance if there is another path without resistance? [duplicate]

Let's suppose that a single battery is connected with a wire, which does not have resistance. Electrons will start to flow , in reality, with a wire with resistance, a potential difference would be ...
0
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1answer
49 views

Does a battery 'excites' current to flow in a superconductor? [duplicate]

If yes, how is it possible since a closed circuit with no resistance means 0 voltage, how does the electrons flow initially if there's no potential difference? Any simple explanation or analogy would ...
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2answers
76 views

0 Resistance in Parallel Circuits [duplicate]

If two resistors (5 Ohms & 10 Ohms) are connected in parallel, current will flow through both resistors. Then, assume a parallel circuit (5 Ohms & 0 Ohms), why does current flows to the path ...
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3answers
116 views

This question was on my physics test (about basic DC circuits) [closed]

So in the following question: Because the wire has a resistance of near 0, is there no current going through the resistor with the arrow pointing at it. I understand that normally both resistors in ...
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2answers
82 views

Why do resistors heat up less than short circuited wires if resistors have higher resistance and therefore turn more voltage into heat?

If you short circuit a wire, it will heat up and possibly melt or catch fire. If you add a resistor neither the resistor nor the wire will light on fire (if the resistor is good enough). I know that ...
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2answers
291 views

Mixing a jumper wire with parallel resistors [closed]

I've been having trouble trying to figure out how to properly get the equivalent resistance of this circuit (and ones similar) it is always an issue for me when there is a jumper wire that doesn't ...
0
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2answers
537 views

What is the value of EMF during a short circuit?

During a short-circuit, 'theoretically' current becomes infinite. But what about the emf? My attempt: Since the potential difference is zero, I guess the emf should also be zero. But again since p.d. ...
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1answer
192 views

Why can't I measure my solar panels short circuit current?

I connected the multimeters COM port to the negative lead on my solar panel, the 200mA port to the positive lead on the panel. I then pointed a lamp at the solar panel the voltage was around 7V, but ...
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1answer
91 views

Science of Short Circuits

Okay from an engineering perspective it is obvious that short circuits happen because of electrons taking the path of least resistance, thus bypassing the resistor. Just like how a short circuit in a ...
2
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6answers
292 views

Why does the LED turn off if the high current is going through the short?

None of the other questions related to short circuits seems to answer my question. I understand how short circuits work theoretically, that if there is a path with no resistance in a circuit then all ...
0
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1answer
519 views

Dependence of resistance of fuse on length

Resistance is proportional to the length. Then why is the resistance of fuse independent of length? Should it not change with a change in length?
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1answer
84 views

How come no current flows through the wire of no resistance in this short circuit? [closed]

I am currently solving for the equivalent Norton current through this circuit. To solve for it, I turned my schematic into an open circuit (not pictured) and I need to calculate the current through ...
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2answers
232 views

Effective resistance of a weird looking electric circuit [closed]

A electric circuit (in the picture) is given where all the resistance are of 1 ohm. I have to find its equivalent resistance. (9,10, 11th points are conncections) My attempt: I think electron flow ...
0
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1answer
45 views

If we put a voltage on a big square piece of aluminum sheet how will the distribution of the current look like?

Picture an enormous square piece of aluminum sheet, say of $100\times100(m^2)$, on which' two opposite corners we put a potential difference. The ensuing current is low enough to do no damage to the ...
2
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1answer
352 views

What condition are to be fulfilled for a circuit to be short-circuited?

So I am curious about how short-circuiting works. If I google, I can find some general concepts like the current is too high. But what makes a current too high? So for example if I had a battery of 5 ...
56
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6answers
19k views

If water is not a good conductor, why are we advised to avoid water near electricity (no wet hands near circuits etc.)?

How can water be a medium to conduct current while its ionisation is so negligible that, in principle, no current should flow?
1
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1answer
348 views

Will placing a battery in water short circuit it? (Performing electrolysis)

I've learned about electrolysis and wanted to try it out but i've popped a couple of batteries by short-circuiting them before messing around with embedded programming so I was curious as I see on ...
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2answers
339 views

LR circuits - time constant meaning

If you have a huge time constant in LR circuits, does this mean it takes a long time to discharge and lose all current in circuit? Similarly, if you have a tiny time constant in LR circuits, does ...
0
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1answer
62 views

insulated charged object making contact with an open circuit

I have a circuit in where an "object" is going to be placed instantaneously in the gap of the circuit, but the object will not touch the wire on either side of the gap. The objects has two blocks of ...
4
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4answers
148 views

Is short circuit technically the same as overloading?

Taking the simplest circuit: battery and resistors. If I connect lots of resistors in parallel, wouldn't that increase the current to an extent that it would be technically be very similar to ...
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0answers
40 views

Concept of short circuits [duplicate]

Starting from my secondary school, I have never understood the concept of short circuits. For instance, why would current prefer a path with no resistance than a path with much resistance? How does it ...
0
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2answers
209 views

Why do loads in a circuit limit current?

I found this quote on sparkfun.com and I'm confused. "If you DO have a load in the current, the current flow through your circuit will be limited to that which your device consumes, which is usually ...
0
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1answer
103 views

Adding a “short circuit,” changing currents

Note that this isn't a homework problem, just a question the concept. Let's take this quick circuit I drew up just now in MS paint. There are three different currents, one for the top, middle, and ...
0
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1answer
59 views

Conceptual scheme of circuits

What would happen if I were to connect two ends of a battery with a magic wire of no resistance? In the conceptual scheme of modeling circuit behavior there is always a circuit with a resistor given ...
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1answer
70 views

What happens when I plug charger to itelf? [closed]

I have an amusing experiment with my smart phone charger. That is, after charging it fully, I connect its input and output toghether, and get surprise result. Could you see in my youtube clip and ...
1
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1answer
256 views

Kirchoff's voltage law applied with no circuit elements

Imagine a 1.5V battery with both terminals connected securely via a paperclip. According to KVL, the sum of voltage drops in the circuit (total energy dissipated across circuit elements) must equal ...
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2answers
6k views

If connecting an ammeter in parallel will cause short circuit, why won't connecting it in series does?

short circuit will happen when there is nearly no resistance in a wire, and when a high current almost infinite flowing through the wire, causing high temperature. But connected in series, an ...
-1
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1answer
288 views

What's the difference between a short circuit and a parallel circuit? [closed]

Isn't a short circuit just a parallel circuit with one path having very low resistance? Shouldn't both paths still have the same voltage across them? So why does all the current go through the short ...
0
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1answer
1k views

Short circuit in superposition

I'm really confused about the concept of short circuits. I don't understand, why when you short those two voltage sources, 20 and 10 ohm resistors become parallel? What happens with 4, 12, 15 ohm ...
1
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1answer
58 views

Thevenin equivalent voltage and resistance of a circuit: verification needed

Here is my reasoning: We have to sources so me must use superposition: We first replace the current source by its resistance which is infinite for an ideal current source. Now we need to measure ...
0
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1answer
200 views

Why is Kirchoff's Voltage Rule not satisfied when the circuit is shorted?

For example if I have a simple circuit with a battery and a resistor, and then the resistor is shorted, Kirchoff's Rule is no longer satisfied. Since the current through the resistor is 0, the voltage ...
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3answers
1k views

Short circuit due to loose terminations

I have been reading into wiring and circuits and found someone post that they had a circuit breaker tripping because of a loose wire in the circuit. They claimed the hot screw/lug combination ...
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2answers
357 views

Voltage across voltage source in a short circuit

When we short-circuit a voltage source, the current will be very high. The voltage across the wire is 0V. If we apply KVL, also the voltage across the voltage source is 0V. How can it be 0V if we have ...
0
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1answer
654 views

Applying Kirchoff voltage law to a short circuit

If you consider an ideal wire with no resistance that shorts an ideal battery, the only voltage drop that exists is the emf of the battery, with nothing to balance it. Obviously in the real world ...
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2answers
5k views

Why does all the current flow through a short circuit if its voltage drop is considered zero?

Path of least resistance vs. short circuit I know the path of least reisistance has been clarified already However, to derive the equations you need to assume that the voltage of each parallel ...
2
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6answers
16k views

Current when resistance is 0

A short circuit has $\rm 0$ resistance. We use Ohm's Law $\rm V=IR$. If $\rm R=0$, then $\rm V=0$. Doesn't this mean $\rm I$ can theoretically be anything? Thus $\rm I$ can be like $\rm35A$ for ...
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3answers
226 views

What is the voltage at every pair of points along a ideal wire that is connecting the two terminals of a battery?

If you stick a wire across a battery, obviously it is going to discharge the battery. This will be due to a voltage difference between the two terminals. However, the equation $V = IR$ tells you how ...
0
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1answer
226 views

What happens if connect 2 points with different potential?

I have a very basic question on charge distribution in electric circuits. Let's say we have 2 independent circuits. If we connect a point with higher potential in one circuit to a point with a lower ...
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1answer
133 views

What happens when a wire is conneceted to a plug point directly?

I did it in my school lab and at first nothing happened. Then I jiggled around, sparks flew out with a small explosive sound. It was really cool. The wire ends got burnt and the holes of the plug ...
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2answers
4k views

Potential Difference of a wire?

Imagine a circuit with only a 12 Volts battery and a wire connecting the ends of the battery. Point A and point B lies on the wire. What is then the potential difference between point A and B if the ...
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4answers
9k views

Why does a short circuit generate fire?

When a short circuit occurs it's obvious that there is fire. How come electric energy turns out to be heat energy? What causes the conductors to get hot when short circuit is present.
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3answers
19k views

Proof of Thevenin and Norton theorem

How can I prove Thevenin's and Norton's theorem? Thévenin's theorem can be used to convert any circuit's sources and impedances to a Thévenin equivalent.
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1answer
142 views

Voltage in a short circuit system [duplicate]

We know that current is passed through a circuit if there is a potential difference across the two terminals of the conductor. But, in the case of a short circuit, we say that there is no potential ...
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1answer
145 views

Electrical circuits problem

Batteries have a circuit which looks like this : The electrons go around the circuit and then return through the battery where they get charged again and flow around. My issue is, what about ...
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2answers
6k views

Why is the voltage drop across an ideal wire zero?

I'm having trouble conceptualizing why the voltage drop between two points of an ideal wire (i.e. no resistance) is $0~V$. Using Ohm's Law, the equation is such: $$ V = IR \\ V = I(0~\Omega) \\ V = 0$...
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2answers
1k views

If I switch on a generator connected to an open circuit, are the charges oscillating along wires?

If I switch on a generator connected to an open circuit, are the charges oscillating along wires? Where has the energy gone in the open circuit?
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4answers
77k views

Why does connecting a battery's positive terminal to the negative terminal of another battery not create a short circuit?

This is a question regarding the physics behind the observation. I have guessed the answer to the question, but I may be wrong, so I want to wait for the responses before posting it. Some major ...
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2answers
1k views

is the voltage drop of a battery that is being short circuited the same as the battery's advertised voltige

So I know this is a pretty fundamental question, but I'll ask it any way. lets say you have a 12V battery, and the positive is connected to the negative directly by a wire with negligible resistance......
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4answers
1k views

Voltage drop along an idealized resistance-free wire in a circuit?

If you connected the positive terminal of a battery to the negative terminal to a battery with a wire with (hypothetically) no resistance, and are asked to give the voltage drop of a segment of wire ...