# Questions tagged [short-circuits]

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### Would we need a battery if there was no resistance?

I'm struggling to wrap my head around this idea. Imagine that we have a wire with no resistance ($R=0$). According to Ohm's law $V=IR$, the voltage drop ($V$) between any two points would be 0, and ...
1answer
119 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 ...
1answer
330 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 ...
2answers
955 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. ...
1answer
74 views

### Resistors parallel to short circuit

I have a trouble solving this problem. (Actually, each resistor is not parallel with the bottom wire since the voltage across each of them is different with that of wire.) In the manual, the bottom ...
2answers
40 views

### What will happen if an ideal current source is connected to a isolated resistance?

I know that ideal current source is a theoretical thing. But when it comes to solve problems we have to consider these scenarios. Now suppose an ideal current source is connected with an isolated ...
2answers
227 views

### How does current flow in a short circuit? [duplicate]

In a short circuit, the potential difference across the terminals of a battery (consider a single cell with internal resistance)is 0 according to the equation $$V=E-Ir,$$ where $r$ is internal ...
2answers
111 views

### The importance and the role of a switch in an electrical circuit

There is this simple test: Three identical bulbs are connected in the circuit illustrated in the figure. When switch $S$ is closed: a] The brightness of $A$ and $B$ remains the same, while $C$ goes ...
1answer
22 views

### On ground wave propagation

My textbook says, (ground wave propagation) "Horizontal component of electric field in contact with the earth is short circuited" I am not understanding, what do you mean by short circuited electric ...
1answer
79 views

### Where does the sound we hear from short circuits come from?

Title is self explanatory. Whenever I see or watch a short circuit happening, there is always a humming/buzzing sound going on (e.g., the sounds we hear from this short circuit compilation video). ...
1answer
48 views

### Breadboard LED circuit

Please, just a quick question, am I right that the reason why LED is not lighting is: LED is connected parallel to the wire The wire has much lower resistance, so nearly all current is flowing ...
1answer
64 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 ...
1answer
55 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 ...
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 ...
2answers
412 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 ...
2answers
181 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 ...
3answers
274 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 ...
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 ...
3answers
41k views

### What happens when we connect a metal wire between the 2 poles of a battery?

As I remembered, at the 2 poles of a battery, positive or negative electric charges are gathered. So there'll be electric field existing inside the battery. This filed is neutralized by the chemical ...
2answers
8k 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 ...
2answers
151 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 ...
2answers
507 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 ...
1answer
150 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 ...
6answers
387 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 ...
2answers
285 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 ...
1answer
850 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?
1answer
110 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 ...
1answer
62 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 ...
6answers
23k 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?
1answer
479 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 ...
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 ...
1answer
501 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 ...
1answer
70 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 ...
4answers
154 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 ...
0answers
53 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 ...
2answers
261 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 ...
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 ...
2answers
6k views

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 ...
1answer
322 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 ...
2answers
5k 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 ...
4answers
10k 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.
1answer
324 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 ...
1answer
60 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 ...
1answer
229 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 ...
2answers
520 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 ...
1answer
761 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 ...