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Questions tagged [short-circuit]

An impedance that is non-zero during normal operation becoming very low

2
votes
3answers
42 views

In what kind of circuit does current flow?

In what kind of circuits do current flow? For a circuit to be "closed" does the end point have to return to the start point like in the first image? If you have a straight line conductor between two ...
0
votes
1answer
21 views

Short circuit calculation for KNAF transformer

I am using a 2MVA transformer (KNAF rating will be 30% more at 2.6MVA) The question i have is whether we calculate the short circuit rating based on 2MVA or 2.6MVA? I'm using pu method to calculate,...
1
vote
1answer
41 views

FLUKE 15b+ fuse test

I have accidentally shorted my circuit (5 Volt Vcc) for approximately 1-2 seconds max. While the circuit was short circuit I use the FLUKE as ampermeter in miliAmper mode (400mA max fused) The current ...
0
votes
0answers
39 views

What is the cause of Capacitor short & Soldering pad short & Current unstable on PCB as powering up over time

For the first time, I made a 4 layer PCB and used a lot of 0402 cap / res on my board. But after I soldered the board, the circuit can only work for several mins. The four layers include 3 signal ...
0
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0answers
39 views

Usb micro b 19V and 2.1A safe?

Is it safe to run 19V and 2.1A DC through a usb micro b with no arking and little heat. I know that usb can handle 5v and 2.1A but with the extra voltage can it handle this and not short.
-1
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0answers
28 views

Optocoupler pins 3&4 behaving as shorted

I'll try and be brief for I can go on and on. Also just hobbying. Input trigger is a Keyboard key press. High to low. Premise of this cct is to get 'B' to do the job of 'A' 'A' connected to GND for ...
2
votes
3answers
78 views

How can guitar pickups hot leads be wired in parallel without causing current problems?

I am looking up wiring diagrams for electric guitar pickups and noticing that the common method for combining two pickup signals is just to have a switch that can optionally have both the hot leads ...
0
votes
0answers
20 views

LED COB, Meter reading voltage on isolated backplane when powered

I'm setting up a project lamp for my workbench using one of these LED COB I checked for continuity while doing a test setup, the live and neutral connectors are isolated from each other, and the ...
0
votes
1answer
41 views

What will happen when taps at secondary side of auto-transformer are connected together (short-circuited)?

In case of Auto-transformer, there is only one winding, having three lead wires (1 for primary/input, 1 for secondary/output, and 1 common between both). At the secondary side (the output side), there ...
3
votes
1answer
81 views

Cause for failure after short circuit Step-Down Converter Input

I'm currently evaluating the Semtech TS30042 step-down converter. My input voltage is 24V, output voltage is 5V. I followed datasheet recommendation in my layout in most aspects. The problem is, as ...
0
votes
1answer
28 views

Long vs Short Earth Connection for Single Phase Motor vs 3 Phase Motor Frame

What is the correct way of grounding single phase motor frame if I have to choose between two options: (1) Short to earth connection: from the frame to nearest grounding rod. See below the schematic....
0
votes
1answer
43 views

Capacitor for spot welding

I've seen a video where the guy make a spot-welder using capacitors https://www.youtube.com/watch?v=1SMUFSiaV-8 AFAIK shorting capacitor is harmful. The question is: Are there any caps that can ...
0
votes
1answer
18 views

Need advice with pin connection of an LCD module

Hello. I am working on this LCD module, COG-C144MVGI-08. Like in the image I uploaded, PIN 1, 4 and 12 are ground. (Just in case you need the full datasheet : https://www.avrfreaks.net/sites/...
0
votes
1answer
47 views

How to fuse batteries connected in parallel?

I have two GEL batteries 12V/130Ah and want to connect them together in parallel. Currently I have one battery in the system and it is fused on the positive wire before the isolation switch. I ...
0
votes
1answer
39 views

Testing short in circuit

I think it is a very simple test to perform, but I do not know the correct equipment for this. I just have a basic LED circuit, resistor before LED, but I want to test a short in parallel with the ...
0
votes
2answers
70 views

Thevenin Equivalent Network: How to treat Capacitor across 0v potential, with Dependent Sources?

We were given this question in our intro to EE course: Find the Thevenin equivalent network between points a and b for the circuit shown in the image below: For the short-circuit current, I redrew ...
0
votes
2answers
95 views

Power plane short in PCB

I have a multi layer board and have 2.5V plane as one of the layer. Some how during testing something go shorted on 2.5V. I am using the Toneohm 950 to detect the plane short after removing whatever ...
0
votes
1answer
49 views

Inductor for MOSFET protection

Help me understand the role and effect of an inductor used in the following electrical circuit. The circuit in question is a power supply circuit for around 50 servers in a data center. The circuit ...
0
votes
3answers
87 views

Pull-up resistor circuit clarification

I'm new to electronics and I'm trying to understand pull-up resistors properly. I have a problem with the following schematic: I've redrawn the schematic into my following schematic for better ...
0
votes
2answers
63 views

Do defective voltage regulators pass full voltage through?

I'm suspecting my voltage regulator is defective because I made the same circuit twice with the exact same components but this time, the battery voltage of 7.2V is being passed to the entire circuit ...
-4
votes
1answer
107 views

What happened when you put two light bulbs to complete the circuit [closed]

I have an argument.. In the top section we have two wall plugs hooked up like a common circuit. In the bottom section if we plug two consumers will it work, will it work half the power or it will ...
0
votes
0answers
25 views

lecroy 9314l power supply repair

I've been trying to repair my lecroy 9314l for the past couple of days and i've sort of run into a wall. out of ideas. The power supply started to fail a while ago. It wont turn on when i connect a ...
3
votes
3answers
105 views

Flooded LAN RJ-45 connector may damage connected router? [closed]

I had an accident in the house and one of the LAN (cat. 6) cables including RJ-45 connector has been flooded. This "flooded" cable, along with other (dry) ones, was connected into a working gigabit ...
-1
votes
1answer
41 views

Contribution of the photovoltaic power plant to the short-circuit currents?

What is the difference between the contribution of the photovoltaic power plant to the short-circuit currents comparing to situation with synchronous generator?
0
votes
1answer
48 views

Finding a current through a short circuit (Thevenin)

I am working through a question that involves superposition. I have attached a picture of the question I am working through. I am having difficulty doing question e) and f). I was hoping you someone ...
2
votes
3answers
73 views

Finding current when short-circuiting the terminals

I am working with the circuit shown below. I am having trouble with the situation where: if a short circuit is connected between Terminals A and B. what current would flow through the short circuit ...
0
votes
1answer
61 views

Voltage source Is shorted

I did a circuit to test it using the application everycircuit (https://play.google.com/store/apps/details?id=com.everycircuit.free). But when I did the following circuit I've got the following error ...
1
vote
3answers
494 views

Vss and Vdd pins' position on microcontrollers

I am starting to work on some designs with MCU-based boards, or sometimes just looking at companies' products involving MCUs such as Espressif, Udoo, NXP... I have noticed a puzzling similarity ...
0
votes
2answers
43 views

L293D all inputs high

I want to use the L293D to control 2 motors forward/backward. My question is if I set all inputs (A) high, do I have a short circuit? Because the driver gets really really hot.
2
votes
1answer
34 views

Making a model of a transformer

According to this link, the equivelent circuit diagram of a transformer (seen from the secondary side) looks like: Now, I want to find the values of the following constants: $$R_p,X_p,R_c,X_m,R_s,...
0
votes
2answers
39 views

Thevenin Norton Concept

For the below circuit, assuming I add a short circuit between terminals A and B (let's call it Isc), howcome I can't use a KVL equation for the left loop, along with the right loop (IsR1 - IscR2 = 0)?
0
votes
4answers
98 views

Why can closing a circuit breaker into a short circuit result in an arc flash?

NFPA 70E 130.6(M) states: After a circuit is de-energized by the automatic operation of a circuit protective device, the circuit shall not be manually re-energized until it has been determined that ...
5
votes
2answers
834 views

Half duplex: How to prevent shorting?

Consider two Arduinos (ATmega328P), with pins 2 connected for half-duplex communication (e.g. using SoftwareSerialWithHalfDuplex): Both Arduinos may be transmitting at the same time, either for logic ...
0
votes
1answer
40 views

How can electronics “short circuit” when you plug in cables

I have recently been troubleshooting a component on a CNC machine. The device is connected via etherCAT to the machines controller. There is also a power cable that goes to the component. Basically ...
-1
votes
1answer
271 views

Lead acid battery internal short [closed]

In trying to revive an old lead acid battery I have drained the acid solution from the battery and am attempting to clean the plates with an Epsom salt solution however once drained there seems to be ...
0
votes
0answers
45 views

power pin to ground impedance- Short(0.3 Ohm) [duplicate]

I am designing a board and the problem I am facing on the board hardware is that the core power supply and ground has very low impedance of around 0.3 Ohm. This is leading to a conclusion of two nets ...
0
votes
1answer
63 views

Why does the electrical power of a generator that is close to the short-circuit fault location decrease?

I was reading about shunt faults in power systems in the book Fundamentals of Power System Protection by Y.G. Paithankar and S.R. Bhide and the following sentence confused me: "Further, in an ...
1
vote
1answer
238 views

Short Circuit Detection in wire

I am looking for a way to detect a short in a piece of wire. I want for an LED to light up when the wire is shorted. i started off by using an op-amp comparator but this didnt work. the specs of the ...
0
votes
1answer
422 views

Why is there a gate-source short on the n-channel mosfet? (circuit attached)

I am having a problem with the circuit below. I am trying to use the IRLR8726TRPBF to switch a 24V pump by turning the Gate HIGH and LOW using the Arduino. However, there when I connect power to the ...
2
votes
6answers
215 views

What is the voltage potential of ground during a short

During a short, is it possible for the voltage potential of the ground to change? Say for example, we short a 9V battery, how does the ground stay at 0V and not become 9V?
6
votes
4answers
1k views

Short circuit = zero voltage?

Reading this question and its answers (as well as other questions), it seems that in an idealized short-circuit with zero resistance, one concludes the voltage is zero. This seems completely wrong. ...
25
votes
12answers
11k views

Why do we “need” resistors (I understand what they do, just not why…)? [closed]

I have always had a basic understanding of electronics. I am now starting to learn a bit more, using an Arduino as a test platform, and I have a question about resistors that I can not seem to solve ...
1
vote
2answers
126 views

Can this circuit suffer from short-circuit?

I am preparing some circuits for children to be soldered in thumbtack technique. I found some that seem to fit my purpose. One of them is a siren. In the wiring diagram, I see that there's a line ...
0
votes
0answers
26 views

AC regime: Parallel connection of ideal current generator and short circuit and Parallel connection of ideal voltage source and short circuit

I have the following two scenarios in the AC regime: Parallel connection of ideal current generator and short circuit Parallel connection of ideal voltage source and short circuit In the first ...
0
votes
2answers
82 views

AC/DC - Current generator with short circuit

I have the following circuit (AC regime): I am given the current I in the branch 4-5. I don't understand what happens with Ig2 here. Is it annulled? Should the circuit look like this: What would be ...
0
votes
2answers
900 views

When is a resistor actually short circuited?

I am having a bit of difficulty figuring out when is a resistor actually short circuited. Take the following 2 examples: In here, current flows through both 8k and 3k ohm resistors. Why is the ...
0
votes
1answer
78 views

Is the flow of current in this RL circuit ambiguously defined?

TL,DR: Why does i_L in this point down instead of up? I get two different answers for the current i_2 when I imagine them in these different ways. Or am I (likely) making a mistake or missing some ...
9
votes
6answers
1k views

Simplest, cheapest, fast and minimum footprint current limiting circuit with low resistance in normal state

I have a digital output, driven by the high-side driver with nominal voltage of 24V DC. The load current normally is below 100 mA. The output is monitored, so I can switch it off quickly if I detect a ...
1
vote
2answers
377 views

74LS189 chip overheat

I have started work on a new project of mine of building a simple 8-bit computer. Everything I have put together (clock, registers) has worked so far, until I needed to build RAM. For reference I have ...
0
votes
3answers
63 views

Could a short burn a device with high ESD protection

I'm prototyping a device whose schematics is open source and available on-line. I have modified the layout to fit it into an Arduino Uno form factor and now I got the PCBs along with components. Once ...