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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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 ...
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41 views

Why is my CPU core voltage so low, but temperature so high?

I googled the core voltage of the i7-8700k, and it said around 1.25 volts, I am getting between 0.7 and 0.6 volts. HWINFO and my bios both say that my cpu temperature is at 100 Celsius, My AIO doesn't ...
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0 votes
1 answer
54 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. ...
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1 answer
39 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?
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How did the WD Passport Studio external hard drive Firewire Y cable actually work?

There was a weird power design in the Western Digital "My Passport Studio" MS series external hard drives (320GB - 500GB sizes, produced in 2008) that supported the Firewire 400 interface ...
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5 votes
3 answers
2k 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, ...
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1 answer
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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 ...
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1 answer
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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, ...
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159 views

Why different voltage RAM works?

Before buying a new memory stick for my Lenovo G405, I made some research on the type of RAM I had installed until that moment. Everest displayed DDR3 1600Mhz. I browsed the web too so I bought a ...
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1 answer
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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 ...
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Can I use a 12v 1 amp notebook charger on a 12v 0.15amps fan? [duplicate]

I got a fan from a dead psu, it is rated at 12v 0.15amps, is there a problem if I use a 12v 1 amp notebook charger? Will it blow up?
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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 ...
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1 answer
174 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.
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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 ...
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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&...
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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 ...
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1 vote
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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 ...
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1 answer
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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 ...
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499 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 ...
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2 answers
406 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 ...
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1 vote
2 answers
276 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 ...
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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....
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-1 votes
1 answer
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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 ...
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2 answers
139 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
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2 votes
1 answer
5k 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 ...
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2 votes
0 answers
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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-...
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2 votes
2 answers
73 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/...
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0 votes
1 answer
423 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 ...
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0 votes
1 answer
784 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 ...
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1 vote
2 answers
2k 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?)
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3 votes
0 answers
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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, ...
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2 votes
1 answer
105 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 ...
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0 votes
1 answer
94 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 ...
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0 votes
1 answer
71 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 ...
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19 votes
3 answers
10k 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.
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0 votes
1 answer
555 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. ...
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0 votes
0 answers
98 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 +...
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1 answer
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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 ...
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0 votes
1 answer
103 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 ...
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0 votes
0 answers
152 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 ...
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0 votes
1 answer
600 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 ...
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0 votes
0 answers
41 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 ...
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-2 votes
2 answers
358 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 ...
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0 votes
1 answer
41 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, ...
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0 votes
2 answers
7k 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 ...
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4 votes
1 answer
16k 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. ...
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1 vote
0 answers
264 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 ...
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7 votes
1 answer
25k 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 ...
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  • 397
2 votes
1 answer
674 views

Increase voltage on PCI serial port

I have many serial based cash drawers. An issue that I continually face with them is firing the latch strongly enough to open the drawer. I believe there is a capacitor that must be charged and if the ...
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2 votes
2 answers
8k views

What are the dangers of high CPU voltage?

I have a i7 6700k Skylake and I have her overclocked at 4.7GHz with 1.7V. I've seen people saying that you should be wary of putting the voltage over 1.5V, but they all seem to be related to core ...
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