It seems many of these wall transformers will vary the voltage under different loads – very good ones may not but basic ones may well do. I have a automatic Blood pressure measuring machine (bettery as well as charger). God bless, If I am following this thread correctly… Curiosity – how can the layman measure the amperage? keep your head up Murray! I believe Sean did respond to her question. 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. No, the laptop gets 19v, but then reduces the voltage to output to the battery. -DC Output: 19.5V 11.8A 230W However, the power supply that came with it says input: 100-240v AC with output of 12v. The original power supply put out 20 volts at 3.5 amps; 20 x 3.5 = 70 Watts. Thank you for this excellent article and the excellent comments from people who added useful information. It says 12v 5a. Imagine you want to tow a speedboat. He sold me a new 2.4amp charger at cost and I’ve been happy ever since (more than 2 years)! Now imagine you hitch the boat trailer to your bicycle. Now I can sleep and make a knowledgable decision! I have a device rated at 29v 1.4a 60w … The AC Adapter missing.. Am going out on a limb here by answering this as I am not an electrician. You also don’t have to worry about polarity with USB. Bulk Charge. However the C is backwards facing the “+”. The polarity should be noted on the adaptor label along with the Power output etc. No, it don’t cause any harm to your battery. Output 1 = (5V×1A) 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. can you help me out please? If you have a device that needs 20 volts, and you feed it 100, your device will probably not survive the experience, though may entertain you with some fireworks for a few seconds. Backblaze is the solution I use and recommend. It should work fine if the Universal adaptor has the correct connectors/pins that match your phone. (I’m technologically challenged, and a senior citizen, so please forgive my ignorance, and please speak ‘simply’.) I don’t know the reason I am looking into this is the cost of the equipment. The “cameleon” charger is the name Renault gave to this charger. If it’s the + then it’s positive polarity and negative if it’s the -. Kind of feel that I am, hence the question. I = P/V Originally had the booster plugged into the wall outlet, but am having the same problem plugged into the ups. (Excellent article, btw – I tip my hat to you, Mr. Busch. Also, under the “current too high” section above, it explains that it’s OK if your power supply is rated for MORE current (amps) than the device needs; the device will only draw the current it actually needs. Your article starts out describing my dilemma almost to a ‘T,’ then never does really answer the question, how do I know which adapter will work with which device. I have my Samsung Galaxy S3, on the battery it reads, 3.8 V and 7.9 Wh please someone tell me what my USB is supposed to be. One however could use a heaters cord on the lamp. I bought a 12 volt electro-thermal cooler which came with a 120 volt ac adapter showing output of 13 volts. Welcome Guest. I found a spare AC Adapter labeled “Netgear Output:12VDC 1.2A” The block though is slightly bigger and heavier than the original. Of course, it would be a test instrument and not an adapter per se. What is the volt requirement of the device? but now after reading your post last night, i think i already have the idea of what kind of adapter i should look at. The Zagg ifrogz 7800 power supply calls for a 1.0amp input. What Hydraulics are found on a Cessna 150 or 172 – What answer to give the DPE on Checkride? One more thing which i found out was that the adaptor was getting heated up even when the speaker was not switched ON. Output: 3-4.5-6-7.5-9-12V Crank up your Onan or engine generator, or plug into shore power, and your voltage goes up to 14.0 – 14.5 volts, even when your battery is seriously depleted. Will it be a problem if i use adaptor 5v 2A? I'm fairly confident that a low voltage indication is usually accompanied by a discharge showing on the ammeter. Only states 9v DC. Thanks. – – – battery voltage, we would get an efficiency of 62.5% as opposed to 83.33% while using a 1.5X charge pump. Now if I can find a plug that will work in the EU that has the same output would it then work without me burning down my house? Very Frustrating!! I learned that lesson early, when I plugged in my tiny tiny cassette player into this mammoth brick. I can’t seem to find a power supply that goes from 12v outlet to 12v light string. This is because the voltage difference is within specs, and I am GUESSING you could go even higher or lower in voltage. A heater, kettle, hairdryer etc. The exception would be if I was replacing a cord that belonged to something that used a lot of power eg. The adapters are just really similar It may never cause a problem then again the speaker or the adapter may give out. That would reverse the power of the out put wouldn’t it? Wattage can be higher than original as long as the voltage is the same After you know the voltage it is simple to calculate the Wattage… If I may quote the author of this article: If you multiply the voltage by the current, you get the wattage. A basic home battery charger incorporates a transformer and rectifier, to change the mains 110/220 volt alternating current to 12 volt direct current, and allows the mains supply to provide a charging current at a rate determined by the state of the battery. The other day I accidentally threw away my husbands beard trimmer charger. Is there one you recommend? I plugged in my daughters charger to my old sweeper by accident and fried the circuits in my old sweeper, so I bought one from Ebay, only to find the stupid woman had put in a charger that doesn’t belong to the carpet sweeper.
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