Questions tagged [short-circuit]

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

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1answer
442 views

CP2102N Short Between D+ and D-

I am measuring a short between the D+ and D- lines between the USB micro connector and USB to UART chip (CP2102N). However by looking at the photos, there doesn't appear to be a short. Should I assume ...
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2answers
110 views

Voltage Drop doubt

In an ideal circuit with just a battery short circuited, where there is no resistance in the wire, why is it necessary to have resistance along the way? I understand Ohm's Law, and that the current ...
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1answer
344 views

How do I choose appropriate fuse for my circuit?

I am currently using a AC-DC adaptor with specs: AC-I: 100-2040V~50/60Hz 1.6A DC-O: 12V 5A Which is powering up 8 DC motors, 4× 12V 6W 4× 12V (wattage not specified, the motor is meant to be ...
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1answer
121 views

Avoid fire on a battery-powered device [closed]

I was trying to repair a battery-powered electric razor when I suspect there was a short-circuit. The device started heating and it began smoking a bit so I took it and put it in a bowl full of water....
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2answers
1k views

Why is the secondary winding of a current transformer shorted?

I understand that the secondary circuit in a current transformer cannot be left open, as it will result in a very potential difference being induced in the core of the transformer and permanently ...
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2answers
12k views

Why do engineers usually short ground and negative ports on a DC power supply?

I'm fairly new to electrical engineering, and have seen many DC power supplies where someone has shorted the ground (green) port with the negative (black) port. From my understanding, the ground is ...
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4answers
666 views

What happens to the energy stored in a short-circuited capacitor?

Suppose we have an ideal capacitor with a certain voltage between its plates. We connect the two plates using an ideal (lossless) wire, so the capacitor discharges. Where has the energy having been ...
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3answers
200 views

Transistor circuit driving me insane

Consider the following circuit: Now I'm asking to impose the base current as zero and $$R_C=452.35 \Omega $$ Now I have a lot of issues with this circuit because I can't find a systematic way to ...
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3answers
62 views

why would Ix would be 0?

Current coming out of the 5V source would never be 0 so what would make the current coming out of the 3v dependent source 0?
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72 views

For given circuit, does the current “io” through the branch equal zero after short circuit ? [2-port network]

The circuit is; simulate this circuit – Schematic created using CircuitLab For given 2 port network, Im shorting V1 to solve for y22 and y12 and apply a current source at V2.[Y-Parameters] ...
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1answer
787 views

Can the USB port's metal enclosure be grounded?

As shown in the image below, the USB port's metal enclosure is touching the copper clad of the PCB (which is a ground plane). Can Bad Things Happen™ if the port's enclosure is grounded? I beep-...
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1answer
55 views

Measure unknown load resistance on battery terminal

I need a method to measure the load resistance attached to the terminals on a battery. I want to determine this load before I turn mosfet on to let battery pack discharge. Most important I want to ...
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108 views

'Bug fixing' a circuit with HiLink HLK PM01 220V->5V converters

I soldered a DMX splitter together. However, it does not work. I'm sure one of the solder connections broke, but I have to find which one. I want to do this with power connected because that is easier ...
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1answer
357 views

What does it mean if my voltage regulator is acting as a wire?

When i connect 24V to my input pin, and connect ground pin to my Ground, it gives a short circuit at the bench power supply. What does this mean? Did i kill my voltage regulator?
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2answers
484 views

Scenarios where Inductor back EMF would result in damage of circuit or component

Let's say that there is a simple circuit with the following components (ignore values): LEFT: a simple power supply (assume DC) TOP: load (resistor) and inductor RIGHT: switch BOTTOM: load (resistor) ...
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2answers
550 views

Won't a potentiometer powered by a dc supply cause a short-circuit at lower end of the range?

Many tutorials in the Arduino or Raspberry Pi community simulate an analog sensor with a potentiometer. The potentiometer, being a passive device, is powered from the same DC power source that ...
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2answers
392 views

How can charging current be understood intuitively?

The charging current I’m talking about would be the one between un-shorted phases and ground when there is a short to ground in one of the phases in a distribution network or facility. I'm not talking ...
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2answers
430 views

Shorting capacitors using a transistor?

Introduction First off, I'd like to let you know I am a beginner at electronics so some of the stuff I say might be very wrong. What I want to make is a 'spark generator' for lighting some gases in ...
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2answers
414 views

How to find v through superposition theorem in the following ciruit

What is the voltage V of the attached circuit? Using super position theorem. When i active the 9V source & short 12 V source is the current follows in 20 ohms, 10 ohms. & 4 ohms? Or it only ...
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2answers
124 views

Over-current sense

I am using a circuit shown below. it is designed to sense 1.5 A whenever the load takes current >= 1.5 A. Rsen senses the related voltage and activates the transistor. Here I use a Rsen = 0.46 R(0.7V/...
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1answer
650 views

How short circuit is made when connecting negative cable first when jumping start the vehicle

When Jumping start, I understand that I need to connect the positive terminal first due to the safety reason. And also if I connect negative terminal first and touching the body of the vehicle with ...
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3answers
543 views

How can I find out which resistor is short-circuited and can be ignored?

I don't understand how the current flows in the circuit below. How do I deal with the wire between nodes c and a, a and b, g and d. Why is the 5 Ω resistor shorted out? I am having a little trouble ...
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1answer
101 views

How to protect against a short circuit fail in 12VDC X capacitor?

When adding an X capacitor for simple line filtering in a 12V DC electronics project, how would you add protection against an unlikely short circuit failure in that capacitor? Is it as simple as a ...
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1answer
132 views

Short-circuit protection, reverse polarity automotive

I am designing a power circuit and would like to integrate the ic VN5160S to protect it, but I have doubts about the position of it. Would the ic VN5160S be before the DC / DC converter in my circuit? ...
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1answer
275 views

MOSFET-switching between two power supplys: how to avoid transverse current?

For a hobby project I would like to switch between two power supplys. The two power supplys are two 6s LiPo batteries. If one battery is empty i want to immediatelly switch to the other battery. (the ...
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1answer
4k views

LTSpice chassis ground or earth ground

I'm trying to simulate a circuit for a design I'm making. In a few parts of what I'm interfacing with uses relays that when closed will short a few power supplies to the chassis ground and in LTSpice ...
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1answer
137 views

Measuring soil resistivity and estimating soil equivalent resistance in a long distance

I'm trying to size the Neutral to Ground resistor (NGR) in the Wye of a 138 KV to 4160 V Delta-Wye Transformer. In order to find the proper value I have estimated the charging current of the system by ...
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1answer
1k views

How do I connect an oscilloscope to a power supply or function gen.?

I'm supposed to sketch a circuit for my class but the one thing that has me completely confused is the ground connection. For example: I have a breadboard with a 10V dc power supply and two ...
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2answers
125 views

Build my own light bulb

Before I start: I do not have a lot of experience in electrical engineering so I would appreciate clear statements and extensive explanations to be able to follow your ideas. I am currently trying to ...
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2answers
425 views

In a DC circuit, are there any reasons for wiring overcurrent protection such as fuse or pptc PHYSICALLY near the load?

In a DC circuit, are there any reasons for wiring overcurrent protection such as fuse, pptc, etc.... PHYSICALLY near the load(or inside it)? By wiring "physically near", I mean in the power wire going ...
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3answers
369 views

PCB plated through hole short-circuit

We have a board built in the thousands, and several have (apparently) short-circuited a plated through hole (PTH) to an adjacent pour (see photo, note the other thermal damage is probably due to ...
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1answer
96 views

Does shorting this branch disable these resistors?

When I short the branch across the nodes connection R15 and R10 will they be disable, and I only need to calculate R6||R6||R24 + R2?
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1answer
171 views

Internal constant current driver for LED short circuits and blows when connected to AC main (120 V) without DC load

I have AC 85-265V to 0.3A 8-12W DC 22-40V Internal constant current power supply for LED spot lights. This is the exact model https://www.lightinthebox.com/en/p/0-3a-8-12w-dc-22-40v-to-ac-85-265v-...
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5answers
4k views

How can I troubleshoot an active short circuit?

What are some effective methods of diagnosing an active short circuit? By this I mean a short circuit that presents itself only after a PCB is powered on. tl;dr I have a design in the prototype ...
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3answers
128 views

How does current flow in the short circuit? Aren't the two ends at the same potential?

How does the current flow in the short circuit wire ? Isn't potential difference necessary for existence of current?
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1answer
1k views

touch negative and positive side of battery briefly

I on accident made a brief connection between the positive and negative size of a 3.7v battery. Connection was for less than half a second but I saw small amount of smoke come out from the wire. Can ...
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1answer
133 views

Why is my RF switch catching on fire?

The pictured circuit below works nicely as a electronically switchable-gain photodiode amplifier. Except for the small issue that as it is being plugged in, U2, a fast CMOS RF switch, has a nonzero ...
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1answer
1k views

Why is a short circuit in the secondary winding of a transformer reflected on the primary side?

I was reading this answer and I would like to understand why if the secondary is short circuited the primary winding will also reflect the short circuit despite the fact that they are isolated. Would ...
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3answers
129 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 ...
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2answers
640 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,...
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1answer
99 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 ...
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3answers
105 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 ...
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1answer
147 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 ...
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2answers
1k 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 ...
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1answer
284 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....
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1answer
1k 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 ...
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1answer
38 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/...
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1answer
1k 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 ...
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1answer
61 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 ...
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2answers
2k 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 ...

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