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Questions tagged [voltage]

Voltage is the measure of electrical current. This tag should only be used when asking questions related to powering computers and peripheral equipment. It is not for asking about voltage issues related to the commercial supply of power to your home or office.

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Check CMOS voltage from inside OS [duplicate]

I was recently diagnosing a time drift issue for a client located in a different city. Their workstations were having issues accessing the Windows 2019 server due to this drift. Based on the age of ...
NerdAlert's user avatar
9 votes
2 answers
3k views

Is it safe to replace a 11.25V laptop battery with 11.1V or 10.8V?

I need a replacement battery for an older laptop that originally came with an 11.25V Li-ion battery (presumably 3 cells at 3.75V each). The batteries I found online mostly have a nominal voltage of 11....
Dejan Govc's user avatar
0 votes
1 answer
232 views

How many AMPs can a powered USB hub output to a 3.3V NVMe drive (USB 3.0 & 3.2 Type A)

It is my understanding that powered USB Type A 3.0, 3.1 and 3.2 switches have over current control and will only output 4.5 watts around 0.900ma unless the output port is a type-c non pd port on the ...
Simon Hayter's user avatar
0 votes
1 answer
73 views

Can a loosely connected PSU damage a laptop?

is it a bad thing that the cable connects to the power adapter block in a laptop power supply comes loose and is left alone while the laptop is under use (as shown in the picture)? I am worried it ...
JTR777's user avatar
  • 21
0 votes
2 answers
1k views

What could be causing this erratic power/voltage behavior with USB ports on a desktop PC?

In short, I am having issues with what looks like to be power management of USB devices by my computer. I have had the following symptoms pretty much since I bought it in November 2021. When I connect ...
Maurycy's user avatar
  • 123
1 vote
0 answers
118 views

PC sometimes turns on and sometimes not with different outlets

When the Pc is plugged to an outlet and I press the on button, it will sometimes turn on. when the pc is on and goes into sleep mode, it won’t turn back on again. I tried replugging the cord to same ...
hlau117's user avatar
  • 11
7 votes
5 answers
6k views

Can I replace my 11.55 V laptop battery with 15.4 Volts

I have an HP 15-CX0056WM gaming it came with an SR03XL battery 3 cells 11.55 volts 52.5Wh The replacement was SR04XL 4 cells 15.4 volts 54 Wh, is it okay to use it? The vendor told me that this is the ...
Firas SCMP's user avatar
0 votes
1 answer
734 views

Voltage of SODIMM DDR3 slots [closed]

I found conflicting information on the usability of a SODIMM DDR3L module, low voltage (1.35v), as a replacement for a DDR3 module (1.5v), including the mention from someone who has a computer store. ...
sancho.s ReinstateMonicaCellio's user avatar
0 votes
1 answer
621 views

The purpose of PSU & motherboard -12V line

Typically PSUs have -12V line rated about 0.2 - 0.5A. But for what is it used? Is it used for example with one of the +12V lines to get total 24V? What component or so needs that -12V or possibly 24V?
pirho's user avatar
  • 105
12 votes
3 answers
29k views

How can I detect the USB-C power delivery voltage?

I have an HP laptop which I charge with a USB-C charger through the USB-C port. I have no idea which power delivery (PD) version it has and if it's PD-compliant at all. However, as the charging works, ...
Suncatcher's user avatar
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0 votes
1 answer
161 views

Laptop only boots when no internal drive is connected

TLDR: Laptop will not even boot to the BIOS menu when an internal SSD or HDD is connected, there is no visible damage on the motherboard. When booting from a sometimes working and long time taking USB ...
bart's user avatar
  • 1
0 votes
1 answer
565 views

Server power requirements

The computers that I’ve been exposed to only require a typical American 120 volt outlet to the PSU. From what I understand, depending on the homes electrical layout you’re limited to about 15 amps, ...
superkayrad's user avatar
0 votes
1 answer
806 views

Why is the CPU on my HP suddenly under clocked and seemingly cannot go higher?

My laptop base speed is 2.19 sometimes my FPS drop to 1.89 GHz but it be stuck on 2.19 GHz and and it use to overheat a lot which made my PC slower so I had to use a cooling pad and now it's stuck on ...
Quetziko's user avatar
0 votes
1 answer
419 views

Powering my laptop from DC to DC converter?

I use my laptop Lenovo Y700 on solar system, but much energy is wasted when converting DC power to AC and then back to DC. So I bought a 12V DC to 20V DC converter. Is it safe? Or may it damage my ...
michele 's user avatar
0 votes
1 answer
531 views

Can I use a smart socket with an input voltage of AC 120V and plug it into a 220V outlet?

Using a Smart Socket Model SP10 Made by Teckin It's meant for use in the USA with 120V power outlets but it is being used in the Phillipines with 220V power outlets.
user1225339's user avatar
0 votes
1 answer
172 views

Liquid spill Keyboard & Mouse = risk for the PC?

Great Monday start with my coffee spilled on my mechanical keyboard and my mouse... I tried soaking up as much as possible but didn’t open them up to see. For the keyboard when I removed the keys and ...
MFJC's user avatar
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0 votes
0 answers
94 views

low voltage POST only means battery problems?

No doubt the watch battery on the motherboard long since lost its juice. However, I'm not quite sure what error I saw on boot, I think it was before POST and I think it mentioned "low voltage&...
Thufir's user avatar
  • 1,650
1 vote
1 answer
854 views

Can I use a power supply with different input/output voltage for router?

I bought a Verizon g3100 router; it did not come with its external power supply. The needed cord has an input of 105-125v ~ 60Hz 1.5a and output 12v 3.5a. I can't find exact cord anywhere but I ...
Patrick Trauth's user avatar
1 vote
0 answers
109 views

12v from Notebook Mainboard to attach 3.5 inch HDD

I plan to build a low-budget low-power home server, mainly as a NAS. My first Idea was to simply use a RPI 4, it has USB 3.0 and Gbit Ethernet, but I think the hardware is too slow to be fun. For ...
metinkale38's user avatar
0 votes
1 answer
152 views

How to replace my power supply safely?

If something is powered from a 9 V and 1 A supply, you can replace it with a 9 V and 1 or more amp supply. How would one calculate if it is safe to replace it with a less voltage and less amperage ...
Adelita's user avatar
  • 101
0 votes
0 answers
1k views

12v line is showing up to 14v in BIOS (DMM reading are fine)

Purely by chance, upon rebooting, in the BIOS, I saw that 12v line was showing 13.9v, although I used the computer normally all day long. After resetting all settings in the BIOS and reboot, nothing ...
Igor Kolesnikov's user avatar
0 votes
2 answers
815 views

Laptop charger 19V 6.32A 120W Adapter as replacement for 20V 7.5A 150W [duplicate]

Is it safe to use 19V 6.32A 120W Laptop Charger / Adapter , because I lost my 20V 7.5A 150W adapter and the only one I could find locally is the 19V 6.32A 120W , currently using the laptop for Gaming ...
Elanordir's user avatar
1 vote
2 answers
373 views

Is this RAM overclocking?

I have 2 DDR4 sticks (2x16 GB) running with a 3700X Ryzen CPU with an MSI B450M Mortar Max motherboard: one 2x16 GB Crucial rated at XMP 3200 MHz CL16 18-18-36-72 at 1,35V one 2x16 GB rated at XMP ...
Oliver's user avatar
  • 255
0 votes
0 answers
319 views

Does the voltage supplied to a CPU differ per core?

I'm currently trying to find a range of safe voltages for CPU overclocking. As a start, I looked at the automatic stock voltages: Without any Turbo-functions, the voltages in this case range from 0....
Prototype700's user avatar
-1 votes
1 answer
32 views

Can’t Determine charger is compatible? [duplicate]

The original charger that came with my laptop: input: 100-240v ~ 1.2A 50-60Hz output: 19v 2.37A The new charger that I got: input: 100-240v ~ 2.5A 50-60Hz output: 19.5v 4.62A Will this charger be ...
haxs's user avatar
  • 1
0 votes
2 answers
5k views

can i power a device with more output amperage than the device needs? [closed]

I just brought a speaker that runs on 12v power supply. So i want use it on my car. Can i power a speaker with a car battery 12v directly? Speaker input: 12V, 1.25A Car battery output: 12V
user1099591's user avatar
7 votes
1 answer
8k views

How to detect what wattage that my Windows laptop is receiving via USB-PD?

I don't know too much about USB-PD. I understood that USB-PD requires negotiation between the charger and the receiver. So probably my Windows laptop (Dell XPS 9570) should be able to know the current ...
sasawatc's user avatar
  • 171
2 votes
0 answers
2k views

Is it safe to use non-genuine laptop's battery

I own an Hp pro-book 430 G2 Laptop, While I found batteries compatible with this model they weren't exactly the same. My battery is RA04XL while What I found has RA04 written on it. Both batteries Li-...
Ahmad Egbaria's user avatar
2 votes
2 answers
85 views

Why does RDIMM-type memory require less voltage from the CPU?

I have read the following: https://www.anandtech.com/show/6068/lrdimms-rdimms-supermicros-latest-twin/2 https://en.wikipedia.org/wiki/Registered_memory https://www.pcmag.com/encyclopedia/term/62658/...
Grant Curell's user avatar
0 votes
1 answer
638 views

Inverter Voltage Output Measurement

I have an old notebook which the backlight is not working. In order to know the reason why, it would be interesting to measure the output voltage 'Vout' from the inverter. Unfortunately, there are ...
Mark Messa's user avatar
0 votes
1 answer
2k views

Using slightly different voltage battery for my laptop

I’ve an acer laptop (Acer aspire e15) and it’s battery was blown up and doesn’t work anymore. So I ordered a new battery off amazon with correct voltage which was 11.1V as it was written on the ...
brwa hussen's user avatar
1 vote
2 answers
5k views

Can I use different laptop charger- similar Voltage, higher Ampere? [duplicate]

My original laptop charger was output 20V 3.25A. Now I have a charger with output 20V 6.75A. Can I use it? (The real data: Can I charge Lenovo Yoga 11s with Lenovo IdeaPad 15?)
baruchiro's user avatar
  • 107
3 votes
0 answers
212 views

PSU voltage and microfreezes

A week ago, my PC started exhibiting a problem. When scrolling in a web browser or trying to game, microfreezes happen randomly. The PSU is five years old, and some of the voltages look out-of-spec, ...
Aleksandr Kuznetsov's user avatar
2 votes
1 answer
138 views

Does Silicon Lottery apply to individual CPU cores/threads compared to the others?

Can individual CPU cores or threads clock faster than the others due to Silicon Lottery? Is it then reasonable that the rest of the cores are held back by the slower one as they need to match it's ...
VeggieMan's user avatar
0 votes
1 answer
107 views

Dell xps 9350 battery voltage issue

I have Dell XPS 9350 model which has battery issue. So I brought another new battery which is not original yet good one. Now my question is My original battery has 7.6v but the other battery which I ...
Issac Kanithi's user avatar
0 votes
1 answer
627 views

Using two different chargers for the same laptop

I have laptop HP 650 G1 It came with charger with specs: INPUT 240V - 1.6A 50-60 HZ OUTPUT 19.5 V-3.33 A So I want to know is it safe to charge laptop with another charger (same connector, also from ...
Joe021's user avatar
  • 15
20 votes
3 answers
13k views

I am in a EU country where it says on the socket 16 A / 250 volt. Can I charge my laptop which takes 100-240 volt / ~1 A?

My laptop started turning off randomly and I thought maybe it's because of this socket.
user7321268's user avatar
0 votes
1 answer
747 views

Can i use a universal laptop charger for +10.8v 4400mah, 47wh [duplicate]

I have a universal laptop adapter with listed voltage that i can set 12v/15v/16/18/19/20/24v.. i want to try it on my asus laptop with battery rating of +10.8v 4400mah, 27wh.. it's an li-ion battery. ...
Kathleen magayao's user avatar
0 votes
0 answers
160 views

Abnormal voltage range and frequency activity on Intel 8550U

I have recently purchased a secondhand/refurbished HP laptop with i7-8550U CPU and MX 150 GPU. The first thing I noticed is that it runs unreasonably slow on games, much slower than my other i7-8550U +...
Deancue's user avatar
  • 137
0 votes
1 answer
3k views

Using 3.5“ internal HDD connector for a internal 2.5” HDD

I had a 3.5 inch internal HDD, and to connect it externally, I bought a 3.5 inch connector (as 3.5" HDD requires 12V power), which had a chip and external power adaptor - as 3.5 inch HDD can't ...
verstappen_doodle's user avatar
0 votes
1 answer
195 views

Powering a Acer netbook using a Lipo battery

Is it possible to power a 10.9v rated Acer Aspire notebook using a 10.9v/3300mah Lipo battery pack via charger port? Charger seems to be 19v. Does Notebook really need 19v to work? I want to use the ...
smc's user avatar
  • 113
0 votes
0 answers
187 views

Thermistor to Celsius/Fahrenheit/Kelvin in MATLAB

Thermistor to a Temperature Unit in MATLAB I am using an Analog Read Pin on an Arduino Uno to read the temperature as given by a thermistor. The resistor being used on the thermistor is 220𝝮. What I ...
Noah Wilder's user avatar
0 votes
1 answer
701 views

Choosing the right stabilizer / Voltage Regulator for Laptop Charge carts (40 capacity)

A client has a laptop charge cart rated input @ 125VAC & output also @ 125VAC. Total 1875 Watts. specs: http://www.v7world.com/us/products/charge-carts/charge-cart-30-devices.html#horizontalTab5 ...
FSG Sales's user avatar
0 votes
0 answers
43 views

What do I need (powerwise) to plug my French gamer PC in Canada

I read on metastack that superuser is the place to ask hardware related stuff, hope it fits. I recently move from France to Canada and I'm going to get my gamer PC shipped soon. What will I need to ...
m.nachury's user avatar
  • 101
-2 votes
2 answers
403 views

RAM upgrading tips

I am going to increase RAM size by add another DIMM in the 2nd slot of my motherboard. My concern is how to buy RAM online with exact voltage, speed, single or dual channel. Will my mother board ...
jasinth premkumar's user avatar
0 votes
1 answer
54 views

USB type C power

I use a USB cable (normal type A male on one end) and type C on the other. I connect the C end to my Samsung tablet and the other end into my DJI Mavic drone remote controller. The connection works, ...
user avatar
1 vote
2 answers
11k views

Okay to supply more amps? Use a 14V 4A 56W power adapter on a 14V 3.21A (45W) monitor?

I have a Samsung 4K monitor, LU28E510DS/ZA (Costco exclusive variant), with a back panel describing DC14V 3.21A. I cannot find an exact replacement power supply. I found one that is close at 14V 3A ...
Basil Bourque's user avatar
6 votes
1 answer
25k views

Lenovo Trim Yellow rectangular power adapter

Need Lenovo Yellow Power adapter connector information, its a MYSTERY to me!! Options ‎ Hello all, I recently just purchased my first Lenovo products with the new Yellow rectangular power adapter. ...
ROBO's user avatar
  • 71
1 vote
0 answers
267 views

Laptop charger voltage

I bought a laptop from the US. Now the part that connects from the power brick to the wall socket says 7A 125V. Unfortunately, the end that goes into the wall socket does not fit. So I replaced the ...
Sam's user avatar
  • 11
7 votes
1 answer
29k views

USB-C Chargers: Is it safe to charge a phone with a laptop's power supply?

I have an HP Chromebook and a Nexus 6P smartphone, and both of them use USB-C connections for charging. When I plug the Chromebook into the Nexus's charging cable, it works fine and I just get a ...
sffc's user avatar
  • 417