What is Short circuit: Definition and 92 Discussions
A short circuit (sometimes abbreviated to short or s/c) is an electrical circuit that allows a current to travel along an unintended path with no or very low electrical impedance. This results in an excessive current flowing through the circuit.
The opposite of a short circuit is an "open circuit", which is an infinite resistance between two nodes.
I would like to do now (theoretically) a couple of rather naive things with two batteries with voltages ##V_1## and ##V_2## in parallel charged with an abstract load with resistance ##R##.
Usually, one learns in elementary electronics that the only "right" configuration with batteries in...
Have you ever wondered why you can get an electric shock when touching a circuit, even though the human body has a higher resistance than the conductors in circuits? It goes against my belief that electricity always follows the path of least resistance.
Science project. Real generator. But self made generator multiple magnets.
What happens if I spin bar magnets inside a copper wire ring? Instead of rotating 2 separate copper rings inside a magnet that will split different flowing current on to different wires where a brush can join them...
Hi, I'm wondering why shorted circuit geometry like figure 2 did not sense photocurrent?
Even if the the circuit composed like 2, I guess that by the Kirchhoff's Law, voltage should apply to the ampere meter and photocurrent should be sensed. But in real experiment, I found that shorted circuit...
My reasoning is as follows: with the short circuit present, a 0 resistance can be considered between the terminals. Then, since the only objective of the short circuit current ##I_{SC}## is to give information about the Thevenin equivalent resistance and the open circuit voltage (the existence...
If I have two parallel bars serving as a DC bus with a capacitor across the output and there is a short fault event, I know the peak current is limited by V/X. The instantaneous current would be a function of the time RLC time constant. How do I relate this to the force on the conductors due to...
Here's my attempt:
The results I got are close to the required answer, but there is a question telling:
I tried to solve it, but Isc and Vt (in open circuit) are decreasing with the increase of the field current , so I didn't get the right answer. Could someone let me know where is my...
Hi all!
while simplifying this diagram, I thought that R2 and R4 are in parallel
while
so I simplified the diagram to this
BUT THE SOLUTION CONSIDER THAT R4 AND R2 HAVE BEEN COUR CIRCUITED!
Any help would be highly appreciated particularly a rule of thumb that helps me to identify a short...
I am seeking direction, information, resources and thoughts on the following subject. The common interpretation of the National Electrical Code does not allow you to use multiple smaller equipment grounding conductors in place of one larger one (except in a few cases such as a cable assembly...
Good evening to everyone!
I'm pretty new in this kind of job, so every help or advice will be helpfull and I will appreciate it.
I know that short circuit current from picture in attachment depends on impedance and reactance of Source MV, transformer example (10kV/0.4kV) and cables. So if I...
Assume a superconducting parallel circuit being shorted, a 10V ideal battery, and a 5 Ohms resistor connected on one of its path. This means the shorted path has a 0 Ohm resistance, which also means it has no potential difference, how is this even possible if voltage across in a parallel circuit...
I've seen answers saying that electricity takes path of least resistance, I know this and there is no need to explain this for me.
A forum's answer told me that the electrons initially flow through to the path with resistance and eventually becomes congested (redirecting the remaining electrons...
Homework Statement
Pic A, what's the I2?
Pic B, what's the current across a-b ?
Homework Equations
V = I*R
Voltage in series is different, the current is the same
Current in parallel is different, the voltage is the same
The Attempt at a Solution
from Pic A, I found that I1 = 1A, I3 = 1A...
Homework Statement
[/B]
I'm going exercises and I understand that if the circuit is short circuited that R=10 ohm is 0. (Trying to find Thevelin R in all of these btw)
But then I ran across this one where when it's short circuited, isc is found using the current divider principle and it's...
I work at a electric arc furnace. We measure a lot of items on our furnace and found that some weeks we preform well and other we do not (kwh/ton). With everything else being equal i believe that the utility's available short circuit current is affecting this.
The utility feeds our substation...
In the circuit in the image attached, why does no current flow between C and D? I've been told it's a short circuit I just don't see why, there is a resistor in that branch. The source is connected between terminals A and B.
Hi,
Silly little question about the transformer short circuit test.
When I perform it with the secondary shorted and I get Req = Power / current2
is this Req = Rpri + Rsec?
If I measured Rpri and Rsec with a multimeter?
Thanks
Homework Statement
In the figure in the picture uploaded assume that the switch has been closed for a long time such that the inductor acts like a short circuit. Through which resistors does the current pass through and why??
Homework Equations
A short circuit is basically a wire or a zero...
Homework Statement
Homework Equations
V=IR
Current Loop method, KCL, Node Voltage
The Attempt at a Solution
I am struggling with this problem because I haven't seen a circuit like this before. I think I found the Voc correctly (4V) but I am stuck with finding the short circuit current. I...
(sorry, I couldn't figure out how to insert an image from my drive) I have a problem where in finding the thevenin resistance I take out my independent sources and as a result I'm left with a resistor parallel to a short circuit. Should I ignore this resistor when calculating equivalent...
Hi everyone!
As a Belgian student electrical engineering, I am going to Peru this summer with Humasol vzw, a development organisation that works with engineering students. Our job is to build a hydro turbine next to a small river to provide a little community with electricity. Also part of our...
Homework Statement
I'm trying to understand the dependence of short circuit current and open circuit voltage on illumination.
Short-circuit current is due to the generation and collection of light-generated carriers -- so does that mean the short circuit current is linearly dependent on...
Hi friends ,
today we are just general talking with my boss. and he asked me a question . and that is,
if we have equipment that is rated short circuit current is 40kA. for 1 sec. and if we must have to use that same equipment for 3 sec time. that how much short circuit current they can...
Just a curiosity about what happens to the flux, when you short circuit an induction machine.
Say there is an initial flux and you're rotating the shaft of an IM and then you short circuit the stator, so no doubt you'll get large currents in the stator, but those large currents, will they cause...
Hi folks,
I would like to clarify few doubts on my mini-project as mentioned below:
I am designing a small kit using a transistor (2N3904) and an OP-AMP (LM741- Voltage follower) with few resistors connected to them. My power supply voltage value is 5V. Please refer to the below picture for...
Hi, So we're doing this Lab on Transient reactance of a synch generator and I'm reading Sarma's classic: Electric Machines Steady-state theory and Dynamic performance p. 474-479
But I can't see how to get the actual exponential time constants for the sub-transient and transient reactances?
Thanks
Homework Statement
I'm in a lab and we have this circuit & question as part of the pre-lab
The Attempt at a Solution
I began trying to use nodal analysis to get Va & Vb & to then use Vab to get the voltage and then the current but after doing what you can see above, I stopped because I...
i know that short circuit is when current is max while resistance is zero and open circuit is when resistance is infinite and current is zero, but in terms of voltage, if i have a part of circuit and i want to know whether it is short or open circuit and i only know : the voltage and if the...
I'm reading about short circuit current in a solar PV cell and I am a little confused.
The short circuit current is defined as the current across the solar cell when there is zero potential difference across the cell. At this point the short circuit current is equal to the light current.
What...
Homework Statement
A short circuit test is performed on a small single phase transformer. The results are:
Primary Voltage 5V, 60Hz
Primary Current 2A
Secondary Current 10A
Primary Power 8W
a) Making suitable approximations deduce the primary/secondary turns ratio (single number)?
b) Making...
Hi,
It's been a while but from what I remember when you short circuit a transformer, electrically it's like you've series'd up the coils and shorted the magnetisation branch. And when you open circuit a side of the TX it is like the current flows through a side then through the magnetisation...
Homework Statement
Which of the following are self-contradictory combinations of circuit elements?
- A 2 Amp current source in parallel with a short circuit.
Homework Equations
KVL- "the sum of voltages around a closed loop amounts to 0.
KCL- "the current into a node equals the current out...
Homework Statement
Find the equivalent resistance of the circuit shown below.
Homework Equations
R=\Sigma_{i}R_{i}
1/R=\Sigma_{i}1/R_{i}
The Attempt at a Solution
I'm having a lot of trouble understanding how this circuit can be simplified. All I see is a big short circuit where the...
Hi everyone,
I am working with a solar cell realized with a metal-semiconductor junction. I need to find an expression for the short circuit current of this solar cell, but in the literature I have only found models for the standard case of a pn junction solar cell.
Does anyone know a...
My doubt is about the circuit in the picture. The capacitor is charged ans the switch open. There's a voltimeter connected to the terminals of the capacitor.
Does a current flow through the wires of the voltimeter causing a short circuit? If not, what would happen in the circuit described...
Homework Statement
1) If one is using light bulbs to detect phase sequence then it is wise to connect them in series with circuit resistor. Why ?
2) There is short circuit in phase "A". In which case is short circuit voltage larger, in four-drive (?) system or in three-drive (?) system ...
Hello guys,
I have to make a short circuit calculation for school but I am a bit lost.. I have a copy off the IEC61363 and internet connection as my help lines.
Homework Statement
The network consists of a generator feeding to switchboard A with a cable in between, on the same...
Hi All,
I am trying to make a system which supplies a large burst mode AC signal to a piezo and then short circuits the terminals once the burst is over( here in the literature).
The system has a Function Generator attached to a High Power amplifier which is attached to the leads of the...
Homework Statement
Homework Equations
The Attempt at a Solution
I am trying to find the value for i as i→∞. Since ∞>0, I must look at the circuit when t>0. However, when t>0, there is a short circuit. I know that you can short circuit resistors so I can easily short circuit the...
Here find some attached circuit of three phase cabinet which operation voltage is 400V /415V and have operated current 800A, fault current for 1 sec is 46 KA and have incoming and outgoing links with one phase Lighting and socket.
I want to know is there some method that one can calculate...
Homework Statement
A 50 KVA,6360 V/230 V transformer is tested on open and short-circuit to obtain its efficiency,the results being as follows:
O.C.:
Primary Voltage-6360 V,
Primary Current-1 A,
Power Input - 2 kW
S.C:
Voltage across primary winding-180 V
Current in secondary...
Homework Statement
http://postimg.org/image/b8p4rszot/
There is a short circuit between the terminals a-b
Homework Equations
The Attempt at a Solution
so I found the node voltages at 1 and 2, but I don't know how to use these to get the short circuit current...
Hi, After adding a wire across a circuit to section off part of the load in the form of a short circuit, I am still seeing a couple of milliamps flowing through the load. Is this due to the fact that the wires used to create the short circuit will have a small amount of resistance, hence...
Hi,
Would someone care to please explain why no current passes through R1 (see attachment) in case Vs is replaced with a short and the inductor is considered a short too (in the steady state, for DC)? Why would the R1 branch be open and not short? Is it not in parallel with short under the...
This was a theoretical / rhetorical question posed by the professor during class. He hinted that this will be on the next quiz. I think I know the answer, but can you guys verify it for me?
Homework Statement
Why do we not perform the Open Circuit Test and Short Circuit Test one after...