Questions tagged [short-circuit]

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

Filter by
Sorted by
Tagged with
0 votes
0 answers
42 views

Short circuit in the voltage source [closed]

R1=R2=8 ohm; R3=2 ohm; R4=6 ohm ; U=80V ; I= 10 A Why does the sources disappear? I would say the current source is now 20A.
Esmeralda Villaverde Jara's user avatar
4 votes
2 answers
344 views

Two X capacitors from lines to ground- why? GFCI fault, even after replacement

I'm trying to repair a very old printer (circa 1980). When I plugged it in, the GFCI outlet protection immediately tripped, even with the printer turned off. The hot side of the cord is connected to ...
BZo's user avatar
  • 1,771
0 votes
0 answers
52 views

Is my PCB shorting to ground?

I am working on a senior design project that utilizes a 3.7V lithium ion battery. Before I connect to the board, the pins show 3.7V (as expected). When I plug the battery into the connector, measure ...
Carson Green's user avatar
0 votes
1 answer
113 views

Identify IC component (voltage regulator?), L8=6G 93W

I connected the PCB to the power supply to check which parts received power and which did not. In doing so I fear I may have short-circuited the 2 components, in fact they have now become hot when ...
EleHob's user avatar
  • 1
0 votes
1 answer
67 views

Equivalence in circuits

I'm studying circuit theory, with only linear elements and no capacitors or inductors or mutual inductances, so no differential equations. All the sources (current and voltages) are constant. To be ...
selenio34's user avatar
1 vote
1 answer
55 views

How to design short circuit and reverse polarity protection for PCB?

I have read many posts and articles about short circuit and reverse polarity protection design for a PCB, but still I am quite confused about the industry standard/common principles here. The ...
eidetech's user avatar
2 votes
2 answers
79 views

Dual Rail Reverse Protection Circuit for OP AMP inputs

Is there a way to resolve this? When wrong polarities is applied,then I wanted no voltage or current flowing towards the OP Amp. Thanks!!
HuracanWind's user avatar
-3 votes
2 answers
234 views

Symbol for ground vs symbol for a battery [closed]

Could anyone help me to understand if this picture is correct? It is to understand the difference between the symbol of a battery terminals and the symbol of a ground terminal. I would also ...
Daniel Prieto López's user avatar
2 votes
3 answers
235 views

What happens when you get a fault to earth without an MEN link on a 3 phase generator? [closed]

For context, an isolated type single phase generator (no earth stake or neutral-earth link) had a residual current device connected to it and then a fault between active and earth was placed on the ...
SS1's user avatar
  • 89
2 votes
2 answers
748 views

How much power in an IC to feel hot

Is there any rule of the thumb at which power dissipated in an IC one should be able to feel that it is hotter than the other components? More specifically, I have a "signal" that should ...
Sandro's user avatar
  • 7,099
1 vote
0 answers
44 views

Old house with no neutral/no ground switches

So, I want to put some small monitor near the door. The only thing I have there is a simple on/off switch of old, with no ground and no neutral. Since this switch is 95% of the time off, the voltage ...
Ronen's user avatar
  • 11
1 vote
0 answers
54 views

Pi Pico shorted after working fine

After working for a couple of weeks, a pi pico is just shorted. It is used on a board that gets a midi signal as input and controls six mosfets as output. When powered by usb maximum power is drawn, ...
Nico's user avatar
  • 11
1 vote
1 answer
100 views

What is this 2-pin motherboard component and is it broken?

I own a ASUS FX505DT Notebook and the fans stopped spinning so I wanted to check the voltage with a multimeter. I accidentally slipped of one of the terminals and released some "magic smoke" ...
Marvin's user avatar
  • 13
2 votes
3 answers
346 views

Isolation transformers and short circuits

For some quick background and info: I'm a relatively fresh (~2y/ experience) EE in the solar field. I work in the R&D department of my company. My country operates in a 230/400V 50Hz grid. We are ...
A.K.'s user avatar
  • 29
1 vote
0 answers
104 views

USB 3.0 Debug Cable with a Type-A To Type-C Adapter

I know that the USB 3.0 Debug Cable is just a standard USB 3.0 without the 5V supply line (VBUS). I have a USB 3.0 Debug Cable Type-A to Type-A (in particular this one: USB 3.0 Debug Cable). I need to ...
ABC's user avatar
  • 11
9 votes
6 answers
3k views

Are GX ("aviation") connectors unsafe for high voltages?

GX connectors (unofficially called "aviation") are used for a wide variety electrical applications, including supplying power to soldering irons and motors. Usually, the voltages are low, ...
user148298's user avatar
  • 2,359
1 vote
5 answers
132 views

Definition of a short [duplicate]

I know what a short is, or I think I know. Well maybe I don't. If two wires from a power source are crossed - it's a short. If a component is working normally - not a short. If the component however ...
MiNiMe's user avatar
  • 1,589
0 votes
2 answers
81 views

Parallel connection without resistance with series connection with resistance [closed]

Question is simple: Is this a short circuit and why? simulate this circuit – Schematic created using CircuitLab The reason I'm asking is because Falstad circuit simulator marks this circuit ...
Stdugnd4ikbd's user avatar
4 votes
3 answers
308 views

LM311 - all the ones I bought seem to be shorted internally. Am I making a mistake?

This schematic was created for an FSAE prototype car, in order to be used to detect if HV is present. It's called the TSAL (Tractive System Active Light), and I based most of the design from YouTube. ...
BHU1 LORD's user avatar
  • 103
0 votes
1 answer
45 views

Circuit reduction: Voltage across terminals [closed]

I'm new to electrical engineering and there is debate in my class about a problem. We are asked to find the voltage across A and B after reducing the circuit. Circuit is symmetrical. Information given:...
Kamalakshi's user avatar
0 votes
1 answer
50 views

How do two LCD segments get shorted together internally? What can cause that and is there any way to fix it once it happens?

I have a custom segmented LCD I took out of an old device that I'm now driving with an Arduino connected to LCD Driver AY0438. These are old custom displays so I don't have a datasheet or anything, I ...
SherEEf's user avatar
0 votes
0 answers
64 views

RLC circuit split into two circuits RC & RL after the switch is closed

I have the following circuit (old exam question) that asked to find \$i_{C}(t) \geq 0 ,i_{L}(t) \geq 0 \$ For \$t <0 \$ the switch was open. Therefore the inductor behaves as a short circuit and ...
Homer Jay Simpson's user avatar
0 votes
2 answers
139 views

LED Overcurrent Circuit

I've just started in basic electronics. I was simulating some basic circuits at tinkercad.com and I do not really understand why the LEDs in the two circuits in the pictures below have too much ...
Zachary's user avatar
1 vote
1 answer
107 views

What's the real problem of using both negative and positive grounded equipment at the same rack/location?

It's always recommended not to use negative and positive grounded equipment in the same rack/location, as this connection can cause a short circuit. In this example, both devices have their own ...
edM's user avatar
  • 11
0 votes
1 answer
113 views

How a short circuit changes when an inductor becomes short circuit?

I have the following circuit from the book Electric Circuits Nilsson & Riddle chapter 7. The switch in the circuit in picture has been closed for a long time, which means that the inductor behaves ...
Homer Jay Simpson's user avatar
0 votes
1 answer
120 views

STM32F407 Heating up, the decoupling capacitors showing short to ground with multimeter but microcontroller seems working fine

I have an stm32f407 which was running okay for like a month. but now i am seeing that whenever I connect power supply the current consumption is very high and the MCU is heating up a lot. The ...
Mir Hamza's user avatar
0 votes
1 answer
37 views

Rating of circuit breaker for protection

This circuit breaker is rated as 12V-48V 100A and I have to use this circuit breaker between additional alternator (24V 100A) in my vehicle and additional battery bank to provide overcurrent/short ...
James Ross's user avatar
1 vote
3 answers
395 views

How to detect leak or shortcircuit in electrical wires undeground?

Recently, the circuit breaker was triggered when I activated the electricity in a cable buried in my garden. Probably water entered into a junction or I nicked the line by accident... The line is not ...
IceCold's user avatar
  • 824
0 votes
1 answer
39 views

Circuit explanation with short circuit and independent current source

I have trouble applying KVL to this circuit. I am trying to find the current that passes through the 5 Ω resistance but I don't know what to do. I know that the capacitor and the inductor are ...
math_noob's user avatar
0 votes
0 answers
66 views

Calculation of thermal equivalent short-time current

Regarding checking the thermal resistance of switchgear "Ith", To make the comparison, one can compare the permanent short-circuit current "Ik" calculated by the ETAP software and ...
zazar's user avatar
  • 1
0 votes
1 answer
62 views

How to correctly model a grounded short circuit?

Specifically, I'm thinking of something like this, except where we're not assuming the current source and wire have zero resistance and hence zero voltage: (To be clear, I know that intentionally ...
Mikayla Eckel Cifrese's user avatar
8 votes
2 answers
776 views

Entire FPGA getting hot evenly, not just a single hot spot

I have a board with an Altera EPF10K30RC240-4N that is not functioning at all. There is a high current draw on the board. The +5V rail is only 2.6V and there is 4.2 ohms between +5V and GND. The board ...
jfriend's user avatar
  • 507
1 vote
1 answer
64 views

Do HVAC capacitors have a safety rating?

If I place a capacitor directly on the 120V home power line, someone has probably been careful in choosing its safety rating. The most important thing to avoid is end-of-life damage in which the ...
bobuhito's user avatar
  • 492
2 votes
3 answers
167 views

How to quickly detect and switch off a shorted circuit (e.g. 30 VDC, 20 A intended, <5 ms response)

Summary I'm designing a circuit that's meant to provide a short pulse of medium-low voltage, high-current, power from a capacitor bank to a low-resistance load, and I want to interrupt it if the ...
Eric Anderson's user avatar
2 votes
1 answer
104 views

IGBT driver circuit protection confusion

I was reading a paper regarding the IGBT driver circuit based on M57962AL IC. I haven't found better information regarding the use of this IC in the datasheet therefore I had to read this. I am ...
kam1212's user avatar
  • 593
0 votes
1 answer
261 views

15 ohm resistance between 5V and ground is it short circuit?

My Macintosh 7100 has 15 Ω resistance between 5V and ground so power supply goes to shutdown. Unfortunately I can't find any schematics for those machines, so I have no idea how to trace the fault. ...
zabykrinich's user avatar
0 votes
0 answers
31 views

In Etap, why don't I get a selective tripping sequence when I simulate a fault knowing that the relays' curves are selective with each other?

In ETAP, I have two relays that are selective with each other in the Star View. However, when I simulate a fault in the bus that's right after the downstream relay, the tripping sequence is buggy and ...
A.Bukhari's user avatar
0 votes
0 answers
48 views

In an ETAP simulation, why do I get different tripping sequences depending on whether I simulate a short-circuit before or after a specific CT?

I have a simulation of a relatively simple power system on ETAP. Relays are selective with each other in the Star view, however when I simulate a short circuit, the sequence of tripping that I get ...
A.Bukhari's user avatar
0 votes
1 answer
135 views

Can anybody help me identify this SMD component?

I'm trying to identify this SMD component. If I'm not mistaken, what's written there is "23F" Device: Laptop Model: Toshiba Satellite C850-P5010 SMD Location: Near display connector Problem: ...
Skr's user avatar
  • 3
0 votes
2 answers
33 views

How to draw the curve of the charge Qc

How to draw the curve of the charge Qc as a function of time for an RC circuit, whose capacitor is initially charged and without source, when closing the tap
Blanca Prieto's user avatar
3 votes
3 answers
601 views

How can I find the Thevenin's Equivalent on this problem using Superposition Theorem?

I am reading Foundations of Analog and Digital Electronic Circuits from Anant Agarwal. In chapter 3 there is the exercise 3.11 at the end of the chapter that states : Find the Norton equivalent at the ...
Homer Jay Simpson's user avatar
0 votes
3 answers
62 views

Will this scenario trip the GFCI?

An inline GFCI rated at 15A 120VAC with 4-6mA trip level is used to provide 120VAC to an AC-DC converter. The converter outputs +12VDC with max 1A current. This is then used to power a high voltage DC-...
earl's user avatar
  • 1,105
0 votes
1 answer
200 views

Can an 18.7 Ω resistance between Vcc and GND cause an increase in current?

This is an ECU PCB and the measurement of resistance between Vcc and GND for the TC1762 Tricore MCU in the PCB is 18.7 Ω. I have a reference board, the resistance there is 400 Ω between Vcc and GND ...
John Sall's user avatar
  • 251
0 votes
2 answers
642 views

Earth Leakage Breaker Trips .. Where is the problem?

I am trying to install a UPS in my home .. diagram of the circuit attached. UPS is in first floor. Both floors have separate main circuit breakers .. Ground floor has Earth leakage breaker while First ...
O Ishtiaq's user avatar
1 vote
0 answers
59 views

Why is there a gate-source short on a PMOSFET (DCDC circuit attached)

I am a beginner in power supply units. I got a failed DCDC regulator board and confirmed a gate - source short in a PMOSFET (about 2 ohms in both directions). As far as I know, this board is a power ...
Yolanda's user avatar
  • 11
0 votes
5 answers
249 views

How to know which component in a PCB is causing the short if they're connected in parallel?

The problem is that I have an increased current in my whole circuit than should be, the required current is 0.26 amp, but I have 0.45 amp. After conducting continuity tests, I found that one of the ...
John Sall's user avatar
  • 251
5 votes
4 answers
2k views

Voltage in a Short Circuit

I am very confused about voltage in short circuit. Let's suppose there is a 6 volt battery and both ends of it are connected with the same wire and it's short-circuited. Then because resistance of ...
Rajveer khajuria's user avatar
0 votes
1 answer
74 views

Expected impedance across TX pair and RX pair on a functional RJ45 port

I'm using a sensor that has ethernet output. This new sensor is a replacement of yet another same sensor that seemed to have short-circuit like situation between its RX+/- pins. After connecting the ...
vyi's user avatar
  • 761
0 votes
1 answer
499 views

Can a Brief Short-Circuit Event Damage a USB Phone Charger Permanently? [closed]

I'm hoping to gain some expert insight into a concern that's been troubling me. I've been using a USB phone charger which, according to the manual, has short-circuit protection. However, there was an ...
user11942's user avatar
1 vote
0 answers
81 views

How to calculate short circuit current contribution of a PV plant into network?

I want to calculate the short circuit current contribution of my PV plant. I have only data from the inverter manufacturer but I am not sure if I have to simply add up all the inverter's short circuit ...
Smrtngy's user avatar
  • 37

1
2 3 4 5
16