# Questions tagged [short-circuits]

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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?
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 ...
82k 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 ...
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.
6k views

283 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 ...
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 ...
759 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 ...
240 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 ...
284 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 ...
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 ...
48 views

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 ...
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 ...
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 ...
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 ...
411 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 ...
228 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 ...
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 ...
273 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 ...
951 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. ...
329 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 ...
846 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?
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 ...