I’ve since ordered a correct voltage ac cord with 12V–4A, so I hope it actually works. My input states 100-240v 1.2A – does this mean I should be using a 1A fuse in my plugsocket? One of the most common reasons for a laptop battery to stop charging is its declining health. The power pack isn’t ‘forcing’ the current down the neck of the laptop. thank you very much sire. -Jeff. By nature, direct current is a one-way street, and things won’t work if you try to go up the downspout. More info needed. Thank you very much. “-DC Output: 19V 12.2A 230W The battery is a 1200mAh Ni-cad. It needs something to happen using the centre pin to charge. I turned it off, it made a little different noise the second time and then it didn’t work and I smelled smoke. The same way an old laptop computer has a hard time holding a charge, an old laptop battery struggles too. Plus then becomes minus, and vice versa. It requires a 4.2v and 600 mA charger. The adapter wires are solid black and the other is black with white strip. Thanks for the giggle too, some of the comments above are very amusing. If it pulls out, read the fine print before plugging it back in. pen the casing on the laptop power supply, you don't need to be very careful as we won't be using it again. I know that I have to observe the proper polarity, but I can’t seem to find a transformer that is provide with just bare wires. I have a automatic Blood pressure measuring machine (bettery as well as charger). Also, charging voltages are greater than rating voltage. I have a sony fz series. However, this is a big gamble. The standard volts to charge your battery is 5V, (It depends on the manufacturer that make your phone). You just saved me and my PC. The adapter will run hot until it can’t handle anymore and either turn off or melt. The laptop in turn handles the battery needs. A 10Ah battery at 30 percent charges at … You also don’t have to worry about polarity with USB. 2. A hard call but if it was mine, I would avoid it and get just but a 19V 2.53 (or greater) adapter. It’s a craig 3piece shelf clock radio stereo. Hmm… My advice Hitarth, since this is medial and therefore sounds expensive, I would call the company who built the device and get them to answer the question. My problem is a little different. There are manufacturers, mostly from China, which displays the symbol in reverse where the “C” or open circle is placed on the right. Like a garden hose…….the wider it is the more water can pass through it. I am having trouble understanding how to determine the quantity and raitings of Aluminum Clad resistors I would need in order to bring a 12×12 1/8″ aluminum plate up to a temperature of around 100-120 C. Also how to wire them. Cheers. The other weekend, I sat down and sorted through all my random electronics junk. I suppose is standard for all car equipment. I make a label on my DYMO label maker and wrap it around the cord for each device, paint markers that are colored work on many black things including socks. I’m using an adapter for my laptop which has the right polarity but the voltage and current are not the same. Stepon Voof. My dog chewed on my SeaGate External Harddrive wire so now Im trying to find a replacement AC Adapter. I'm using surface book 2 15, so it has to supply my laptop 95w, but it doesn't use that much. If you multiply the voltage by the current, you get the wattage. Hi this might probably be reaching you late but the receptacle “female” has a positive center and a negative surrounding while the “male” will have some gaps along it’s metal shaft. Call or email Belkin, they should be able to tell you the power specifications. Thanks to you I’ve finally labelled each one and paired them to the correct advice. You need to look at the OUTPUT the input does not matter as long as it was bought in the same country. But with insufficient amps, your device may not work at all, or it it does, it will be hard on the power supply, which may overheat and/or fail – like the bicyclist trying to tow a boat. I do however have a question based on some experience a few years ago about a device that I have coming soon. I have a 12v 0.5amp transformer that has open circuit voltage on 19v. I have a record player that I bought in the US. I will look into it further. If I have a cord that is 120v 60hz and 9w can that be used with a device that calls for 120v 60hz and 15w? So not left of or right but whether the line goes to the centre(dot) or the outer(C) is the way to read it. So, you don’t have any problem to connect your phone to your computer or powerbank. Obviously the label I put on a few lasted as long as it took one of my kids to see it…. I work with electronics and have a 12 volt to 19.5 volt dc converter. I mistakenly plugged in what I thought was the right cord (my masking tape marking was no longer on it), but didn’t think to check the power cord’s adapter output (24 VAC 1.5A 36VA) with the keyboard’s required input (DC in 10-12 volts) before plugging in. However, the power supply that came with it says input: 100-240v AC with output of 12v. P = V*I please do keep the good work rolling. I’m using it since last Sunday. Is .5v enough to really be concerned if I chose to use the 4.5v setting? Cheers. Participated in the Dorm Hacks Contest 2016, Participated in the Circuits Contest 2016. just a tip that has worked to somewhat solve the above problem for me: when you buy any device that comes with a power adapter, take a black sharpie marker and write on the top of the adaptor what device it is for. Correct. Every new device that comes out usually has a custom one. The ends change for different laptops and I still had the pack. Test carefully for polarity. It also is re-markable (pun intended) how it stands out against a host of other color backgrounds including white eggshells to mark the old from the newer ones. Is there a simple way that I can occasionally use my standard 12 volt DC car battery for temporary backup power to the router – via a cigarette lighter connector ? Of course, it would be a test instrument and not an adapter per se. A charger with a terminal that’s compatible to a device port (say, a micro USB cable and port) doesn’t necessarily mean that the charger may be used to charge the device. You should be fine with 5A fuse. Too much power generates excess heat, which is the bane of sensitive electronics. i have 3 power cords that say (10/16 A – 250 V), is there any problem to use any of them in any device? Go figure. Most of the time, companies will just buy an adapter from DVE or something for the specs they need (tip size, mah, voltage, polarity) and will work with a bunch of devices with the same needs. That it must have come with a faulty adapter? What happens if I am powering lights that require 1250 mA for 2 lights and I power 4 of them with 1000 mA. No! The rating on the power cord is just a max voltage rating because in other countries they may have power rated at 250V. its 12V 1.5A positive polarity. P = 50 watts The numbers you are reading are for the battery itself and only concern replacing the battery. I am looking at an adapter right now that is POSITIVE but the “-” sign is on the right, and the “+” on the left. It will usually consist of three circles, with a plus or minus on either side and a solid circle or C in the middle. You can simply check the wires against the remembered (or written down) polarity of the plug - no high voltages involved.Besides that I think giving the tool batteries some more purpose other than lying around when not used in the tools is a great idea! Needless to say, I soon found that the unit would not charge. Elaine just needs to be sure that the Voltage and polarity on her universal adapter matches that of her device and she will be fine. The output one is 5V/1A and the other one is 5V/2.1A. I have a car amplifier. How can I do the changes. Very Frustrating!! Makita technology delivers category-leading charge time, so the battery spends more time working and less time sitting on the charger (battery and charger sold separately). Input: 120V~60Hz The chart you are both looking for is already (usually) included in the wall adapter and on the appliance. The device will draw only as much as it needs, the adapter does not force more. And that is what I assumed. I use the zoom on my smartphone (S4) camera to take a close-up picture of the label on hard to read adapters.. it makes reading them a whole lot easier!.. And do I need to look for polarity? I’m still if sure if the polarity drawing on the adapter is what the adapter does or what the device it’s plugged into should do. One of the easiest ways to recycle any old electronics, including cables and chargers, is through Best Buy. I have question…………what if adapter provides an output both different i mean voltage and current??? It’s not whether the position of the + or – is on the left or right that determines the polarity but what sign is attached to the solid circle. The range you are talking about will work in any country. This convenient charger fully charges a battery in just 3 to 5 hours. To be clear, the booster units themselves have never blown out, just the power supply units. – Yes, they are likely interchangeable even though voltage is not the same. My cellphone charger was indicate 100 – 240v, it is safe to plug-in into 220v outlet? I wasn’t aware of the polarity issue he brought up, but I will take that into account from now on. For future purchases I might try and get multiple adapters when the appliance purchase is first made. What happens? Can it work? If not, looks like it’ll be a new TV for me. Keep the whole thing for around 2 hours or so. Some adapters just have a designation like 20W or 16W on the Input line, one has 300mA on the input line. Standard USB devices have a 5 V dc voltage and a current up to .5 A or 500 mA for charging only. I purchased two used RCA 25425RE1-C business phones, but one didn’t come with an adapter. So, no, do not us a 19v adaptor as you will damage the 15v device.. There would be too much guess work in most cases (for my liking). Amps don’t determine the power and only control the max throughput given by the adaptor or wall socket that it is connected to. The device will only draw as much current (Amps) as it needs at the time. If so can i get a plug that can be 12 volts DC 5 amp i’m thinking if i’m at 100ma which is smaller then max 5 amp i should be ok, I can’t see how to set up a new comment. Yeah – I’ve had the same issue with my puppy (a few years back!). Is the replacement one compatible with the original? Your explanation is correct. Thanks for confirming this! With new phone USB chargers 5v is standard across the board so the higher the amps you buy the better. Your new adapter has more than enough Amp to supply though. but there is the centre pin which checks the battery or charger? You have to take the battery of the cordless drill and connect it with the charger. I have a spare wall wart rated at 9V DC 1500mA that I would like to use which also doesn’t indicate polarity. For lead acid, this is between 10 and 30 percent of the rated capacity. That being said, I don’t recommend fudging the margin under the assumption that you can do the equivalent of driving 5 MPH over the speed limit with your electronic devices. Thanks! You have to charge the battery for a minimum of eighteen hours initially. Again, look for the polarity by either noting a + or – symbol or the polarity diagram. Thanks in advance ;). Donald, your new power supply can provide up to 2amps. If I buy a usb-to-dc 5v cable and connect the powerbank to a laptop with specs like this: I forgot to ask and it’s worth a shot since I rarely come across people like you; Would you happen to have a similarly beautiful explanation for how resistors work in series and in parallel? 3 years ago, Thank you. But the little polarity tip doesn’t lock in place. Making a positive polarity device having the + on the left. If there are three or more resistors then use: Rp=1/((1/R1)+(1/R2)+(1/R3)). The PS2 power supply turns the AC voltage in your wall from the power company into DC. The following will cause harm to your power cord or adapter: The following might not cause damage, but the device will not work properly: Higher current adapter than device rating. Cheers from Australia, Short and brief but very useful, I always had problem in understanding these concepts. All Dewalt tools I am selling a impact driver, drill, sawsall, an heavy duty Dewalt light, with two 18v lithium ion batteries, an one charger, comes with bag as well. Thank you. That’s right. Follow our simple guide to easily create an easy to remember yet secure Password. Input specifications do not indicate polarity any clues on where I can go to look this up? This cordless tool battery charger powers up NiCd batteries for DrillMaster 18 volt power tools. Buying in-store doesn't mean you have to pay higher prices. Your phone also will receive a 5V voltage and will damage if above that rating. i have recently moved to Canada from australia and received a game console from australia i pluged the console in and it turned on completely normally but when i turned the tv on the image began to slowly flicker and scroll down the screen repetitively is this caused by the difference in voltage between the two countries or is it a fault with the console. I have a photo of the adapter if needed. Great tip! The other important term to know is polarity. Matt, If there are only two resistors you can use: Rp=(R1*R2)/(R1+R2) Went back to the store and a very knowledgeable young man discovered that it took at least a 2.0amp charger to charge the unit. In some cases, the plug won’t fit. Rule of thumb: Hello, Great explanations from the numerous experets that piped in on this. In your case, 19.5V x 3.34A = 65.13W, which is about the 65W listed. Output is only DC. Bravo! that wasn’t such a good idea. (And no, I don’t have it upside down.). Please reach out at your convenience: jayaallen * gmail.com. 50-60Hz. I think probably every cord that would work as far as the proper connector would carry at least 1.0 amp. This is because the voltage difference is within specs, and I am GUESSING you could go even higher or lower in voltage. I have a box of over 50 power adapters and bricks of all kinds, yet I still have to go searching for the right one regularly for battery chargers, LED lights etc. You could buy the 65 watt adapter and *probably* be fine – it produces nearly as much power as the original, and your device probably doesn’t draw its maximum current most of the time. The USB also is the symbolized for 5V voltage. I had a 100-240V 50/60hz input on my TV my sister gave me, and had been using a power plug that was 12V–4A, then all of a sudden, it stopped working. All you do is find a wall adapter with an output that matches the input of your device. Thank you kindly in advance and no worries if you can’t. Downloading also makes it drain battery. If I could get one style of adapter that worked on every computer appliance/device (including external hard drives) then I’d be willing to pay a mint for it, and then get multiples of the adapter for backup. Volts are important here and unlike a laptop, the TV will most likely require exact voltage. the battery sing on the lower left corner … start blinking with the switch sing … charging … then suddenly remove charing automaticaly and the charging …. How can I control how many amps from the wall socket go into the adapter? Sidenote: it may well be the TV itself is broken as there are many parts that go over time. After reading your article, I’m wondering if I should try an adapter with a higher amperage rating. I agree with what you are saying and sometimes the adaptors given especially with some Mobiles/Tablets & in this case a Powerbank are cheap and barely meet the min requirements. R = V/I What is the difference between an EM and Non EM adapter? I’d rather fry an $8 adapter than a $120 electronic device, so if I overload the adapter, I’m not too worried about frying it. The amperage (current) of the plug can be higher than that of the device but not lower. Or, look for a diagram showing the polarity. So, instead of the AC 11.5V 1600mA , I was giving 12 V 1.5A DC to the WOOFER. Thanks. It is model F4U041 and the coding is something like this: I’m a little confused on a different term of VA. Your Laptop Battery: 4.2Ah 10.8V = 47Wh Assuming you could transfer the charge from both your drill batteries to your laptop battery with 100% efficiency, AND assuming the Ni-Cad drill batteries are still capable of holding 100% rated capacity, you would be able to charge your laptop battery to 99% once, completely draining both drill batteries. Core i7-8565U 1.8GHz 16GB 512GB laptop. Can i use dell laptop charger for this machine charging ? You may have already answered my question but…..if you use the incorrect charger on a much larger heavier device, can the charger be sort of reverse loaded up with electricity from that actual battery pack and then when used on the correct very delicate device that power fries the sensitive devise? With a little skill, you could swap the wires around.
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