You cant inflate a balloon unless you put higher pressure into it. Dennis. In your case, 19.5V x 3.34A = 65.13W, which is about the 65W listed. R = V/I Thank you very much! I have a lot of extra 12v adapters,if you know the tip size and polarity, I could send you one for about $10. Which is the positive? The second paragraph does make sense. Manage Cookies. It must be an older adapter as I dont see examples of these symbols anywhere on the Internet. This was hands down the most informative, easy to understand article on the subject I have found. if using adaper 15V,0.5Am,7.5W instead of the original adapter 15V,0.36Am,5.4W is it wrong. thanks for this informative guide . Im confused by the parts dealing with current, though. (Excellent article, btw I tip my hat to you, Mr. Busch. Your laptop will simply be under voltage but not much. More info needed. i'm guessing the inline fuse is a 10 amp. A decent UPS provides protection against power surges, spikes and saps. I paid about $80.00 for this thing about 7 years ago and as far as I know, they are no longer being made so I would prefer not to fry it if possible. AC alternating current, so the voltage is reversing into the plug anyway. On this machine near electric connection point, DC 6V is written. the battery sing on the lower left corner start blinking with the switch sing charging then suddenly remove charing automaticaly and the charging . (fan only, not temperature regulation). Parallel = 1/R1 + 1/R2 + 1/R3. Can stock headlight wiring deal with 110 W bulbs? In theory, your device should be fine and not have overheated as it was under powered. The Amps are fine as adaptor is higher than required by the device. To account for this rule, we simply multiply the calculated amps by a 1.25 factor like this. You could buy the 65 watt adapter and *probably* be fine it produces nearly as much power as the original, and your device probably doesnt draw its maximum current most of the time. 1.5v x 8 = 12V, BUT on the side where the power adapter plugs in, it says: DC IN 9.5V, Why the difference? Example: Lets say we want to connect a 200W device to a 12V battery. but i got stuck in a little different situation. Despite many different international standards, most of these devices are made in China with dangerous variations of quality control and even a manufacturers design engineering. First of all, we have to figure out how many amps will run in a 12V circuit if we run the device at 100% wattage. My tablet power adapter wires broke. I need a 500mA 4v adapter and can only find replacement 500mA adapters that provide either 3v or 4.5v. Someone help me.. I have a zillion power supplies too and I dont know what to do with them. Yeah, I forgot to mention I started labeling new power adapters about a year ago so I know what they go to. It first says a device will not work properly if you have a Higher current adapter than device rating., But later, it says, If the adapter has the correct voltage, but the current is greater than what the device input requires, then you shouldnt see any problems.. -DC Output: 19.5V 11.8A 230W How can I do the changes. I didnt know how to use a voltage meter, so I plug the output jacks into my amplifier and noticed it volume input A UPS that includes power conditioning and regulate voltage may help? An i am still confused with the AC DC FLOW . Does coil rewinding have a negative impact with the existing system? Can I use an adaptor with 9v DC and 1.0 A output? Thanks for the information. hehehe you are 100% correct. (I just assumed that, if the adapter fit the hole, it was compatible with the device. There are so many different wall adapters that a list of them all would be impossible to maintain. 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? The device will only draw what it requires from the power pack. If you want to plug a larger inverter into the existing 20A circuit in your vehicle, then as long as the vehicle was wired correctly and the wiring was not modified, it's "safe" to do so, but it's possible that you might blow the fuse. Maybe a second outlet in the trunk? I will try to get a circuit schematic on here, not quite sure where to find that yet though. watts = 10A 12V = 120W. Min. I ended up flunking drum lessons, but for different reasons (lack of talent). It all depends on the OUTPUT of your devices. Ampacity (150W) = 12.5A 1.25 = 15.63A. Clumsy power ratings may also be why your 120W outlet is on a 240W circuit, just in case somebody hooks-up an inverter "rated" for 120W but can push 240W for brief periods of time. Thanks! -DC Output: 19V 12.2A 230W, Another replacement unit specs: If it pulls out, read the fine print before plugging it back in. You just saved me and my PC. Calculate the amps (based on wattage). Heres what you can expect in each scenario: You would expect to see all of the above based on a simple understanding of polarity, voltage, and current. Yes, this is fine. I always count 60% of the capacity as the truly maximum capacity. 10 SEER Vs 16 SEER Energy Savings Calculator + Chart, 17 SEER vs 19 SEER Energy Savings Cost Calculator + Chart, 17 SEER vs 20 SEER Energy Savings Calculator + 1-8 Ton AC Chart, Best Time Of Day To Use Dehumidifier Effectively? But if I get a 300W inverter and I plug in a 250W load, shouldn't the car fuse trip before the inverter overload protection using the numbers above(and assuming 100% efficiency which in reality is not the case)? Many thanks, This may have been the closest I have been able to find anything about power supplies. 250A is quite a lot; AWG wires cant handle that, you will need MCM or kcmil wires. In this case, we will need a 18 AWG wire size because it has a 14A ampacity. I suppose is standard for all car equipment. Whenever you buy a device with a charger, immediately write the device info on a small piece of paper and use clear packing tape to tape it to the brick. The default solution is to try random plugs until you find one that fits into your device. It was a fancy flashlight that you use to work on cars or really light up the night in an emergency, the kind with 5 different modes and all that. Thank you sire for a very comprehensive guide about ac/dc adapter. I have yet to see a device that doesnt indicate this, unless a sticker was missing. Will it be a problem if i use adaptor 5v 2A? It'll do 300W all day, it can push 350W for periods of time, you can probably spike it to 600W for brief periods of time. I believe this is what happened to me. Thats just the 101 of how current works and we have NEC code to prevent this. Polarity is absolutely critical and if in reverse would break your clock/stereo, so always check that first. My device is a negative polarity and need to know which polarity symbol on the adapter matches negative polarity. Very reasonable. It is a computer charger. The AC/DC part should be fine as most laptop charges handle both (it will indicate it on the power supply). Since fuses are designed so that they will tolerate a small overload for a long time (hours or even days at around 5% or 10%) and to blow more and more quickly as the overload increases, the other components in the circuit should also have been selected with that in mind. ELG-150-12A 120W 12V 10A LED Lighting Power Supply If your appliance says input: DC 12v/1A, get an adapter that says Output: 12v/1A DC. what would be the effects of keep using the original 10 awg instead of replacing it by the recommended. You're over-thinking this. What you need to do is to recognize that your circuit needs more amps. Just set it to 10V and ensure you have the Polarity set correctly. The current necessary to run the inverter will go up as the input voltage goes down, so derating the outlet by 50% provides some margin there too. I'd stick to the manufacturer's recommendation of a 120W steady load. Series = R1 + R2 + R3 I am using the 3 volt setting but my equipment is not operating correctly.. What mA should my AC-DC adapter have? The ifrogz 7800 cost $50. 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. Example: If you theoretically calculate that your 12V device requires 15A of current (and account for 80% NEC rule), you theoretically use a 14 AWG wire with 20A ampacity. I thought the polarity was which one( + or -) had a line to the center of the circle, not right or left! If you assume that the device has no indication whatsoever of input voltage, current, or polarity, how is it possible to find an adapter which will make it work without trial and error which could also be called trial and fryer? Wrap the tape completely around the brick. Again I would say it would be fine however, if it did need 2.53amps then the Lenovo 2.25amps adapter would get hot and possible that your LG wont get what it needs. Hi. We have to be quite careful when sizing 12V wires. digital ones are least confusing. The 2A is referring to the max current of 2Amp the device can handle. Having so many chargers can be pretty frustrating. I will call an electrician. Amperage is, technically, not the rate of flow, it is the volume, or amount, of current flow. In the videos/blogs that I have seen it shows the battery number as A31N319 and it is rated at 11.25 volts, yet I can see on the power adapter supplied with my laptop that it is rated at 19 Volts output, so, my question is, wouldnt this cause an issue with the battery receiving 8 volts too much??? 10A to watts calculation with voltage of 12V DC. :/. Would this be acceptable or should I continue looking for a better adapter? Hi, i have 12v high torque gearbox reduction motor 15rpm. Accounting for 75 feet voltage drop, you get up to 14 AWG wire (it has 20A ampacity). The USB also is the symbolized for 5V voltage. I think it has something to do with most dont have a polarized plug and we dont know what is the right way to plug it in without one. Others put just a few details. Never had a problem to date. The last thing you want to do is plug in the wrong adapter and fry your Medical device. A movie is like for 2 to 3 hours Max and it works without any problems . 12v is the safer, lower voltage obtained from 120v using a step-down transformer. 12v is used for low voltage fixtures such as doorbells, smoke detectors, thermostats, and LED lights. Now, I have a some questions related to video games: Thank you so much for this article Mr. Busch. It just takes time and frustrating failure to finally identify what youre looking for, you got it. Now I can sleep and make a knowledgable decision! But if I put an adapter with 24VDC output into a device that requires 5VDC, I can kiss the device and my $120 goodbye. I felt heat suddenly on my device, so I removed it from the power source. You should be fine with 5A fuse. Like a garden hose.the wider it is the more water can pass through it. Also, you might want to check the adapter with a voltmeter. It is model F4U041 and the coding is something like this: Likewise, each electronic device is specifically designed to accept a certain DC input. Output 2 = (5V2.1A) AMPS: are important to be always equal to or higher than required (never less) as it controls the flow rate of power to the device. This connects via a short 1-metre cable to the router by a typical 2.1 mm centre positive male connector. Is it possible to "get" quaternions without specifically postulating them? So long story short if it fits it will work just fine. https://www.sweetwater.com/insync/power-conditioner-voltage-regulator-ups-differences-explained/. I bet the original adaptor got hot as the Zagg was utilising the full 1 amp. Its the 5a 75w that has me thinking it needs not just the plug, but a fat box with the two cords hanging from it too, thoughts, suggestions pls, aa grateful disabled veteran, I got an AMH A399U monitor with a Korean plug and power AC 100-240V 5a 75w. My question essentially boils down to why is the 120W rating given for the outlet different than the fuse actually connected to it (240W)? What does the m mean in 300mA for example? If I could then it must be negative polarity, otherwise it is positive polarity. I do have a few 4V power supplies in a box somewhere. Also a lot of great comments from our user community! Thanks in advance for any help. (I have a 12V adapter I could use, but I dont have a 9.5V adapter.). So, it is as simple as finding an adapter with the same voltage and polarity as the device you need to power? 80w vs 80.4W is 0.4W difference. keep your head up Murray! Just saw this. Would I be correct Im rewiring it using the next gauge up. Thank you for this site and forgive my ignorance in this matter. The original has: INPUT: AC100-240V-,50-60Hz, 1.5A. most likely nothing would have happenedunless the polarity was wrong. One more thing which i found out was that the adaptor was getting heated up even when the speaker was not switched ON. Power Supply (from my monitors manual) That means we need a wire size with an ampacity of 15.63A or higher. The standard volts to charge your battery is 5V, (It depends on the manufacturer that make your phone). How can I control how many amps from the wall socket go into the adapter? 120v is the full line power that requires an electrician for all connections. My Yamaha portable keyboard and its power cord were separated during the cleanup. Ensure your device is rated to the same voltage and to equal or below the max. No music came outjust a hum. Sidenote: it may well be the TV itself is broken as there are many parts that go over time. Here, youll see the volts followed by the direct current symbol and the current. The bigger device has a very heavy battery pack like a couple pound battery and the device the charger was made for is super small and delicate. The amperage output will self-adjust controlled by your device.. Dont use it. Learning a new skill takes time and practice. The adapter I need has an output of 24V and 12W, but the only similar adapter I can find is one that has an output of 29V and 12W. I want to just keep it plugged in all the time at home. The compressor takes 4 AA batteries and runs on a 6V A.C. adapter with a polarity of inner ring(+), outer ring(-). I have a record player that I bought in the US. This includes polarity. Hi. Well I have been doing some searching for batteries for my Asus A551XM Laptop. Im a little confused on a different term of VA. It is great and now I will bring it with me to Europe. Perhaps using a voltage meter? Regardless: I recommend you stop using a 19v adaptor in a 12v device. Thanks for your very useful article. I do however have a question based on some experience a few years ago about a device that I have coming soon. Maybe I'm missing something, but the only high-wattage automotive inverters I've seen come with very low gauge wire and clamps to connect to the battery terminals (or to rewire yourself in an appropriate manner), not cigarette lighter plugs. I can only use these sweepers as I have mobility issues where I cant drag a hoover around with me. My problem is a little different. I had it on the wrong power pack type charger for about an hour when I smelled burning plastic. times amps times volts. About | I can match color and design. On another note, nothing is more irritating than the plugs that are proprietary the old Apple 30 pin ones for example. 12v is known as low voltage. On the bottom of the unit it clearly states: BATTERY 1.5V x 8, DC 12V 12W. Its powered by 8 AA batteries. Complete Guide to Using the Correct Charger or Power - groovyPost Current must be same or higher. Trying to think through this if its rated for 5.5 volts but can run on four AAs, might a 6 volt adapter actually be ok? The Speaker simply started giving the audio. Here I place something different. As you noted that you have had several replacement adaptors and also different units and all have the same issue, it may well be spikes and fluctuations in power at the socket that is causing the issue and blowing out the adaptors.