I got this at best buy and decided to check out the rating of the charger. Is this typical for the 8013? Rated for 0.35 A?!
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Check it out
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That is the charger all the 8013s come with, well mine did.
You may want to look at the output line, the charge will go to 2 amp as needed
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Oh, my.. lmao
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alperin1 said:
That is the charger all the 8013s come with, well mine did.
You may want to look at the output line, the charge will go to 2 amp as needed
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Thank you kind sir. Much appreciation for not degrading me verbally on this post.
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harajyuks said:
Oh, my ...
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WYS
harajyuks said:
Much appreciation for not degrading me verbally on this post
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Um, so you knew your question was ... questionable ... then?!
Anyway, what you're looking at is the average AC input amperage, what it draws from the wall socket.
harajyuks said:
I got this at best buy and decided to check out the rating of the charger. Is this typical for the 8013? Rated for 0.35 A?!
Sent from my SCH-I605 using Tapatalk 2
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In fact, like our friend @kcrudup said, you're looking for the input current drain. I'll try to explain more detailed:
This kind of adapters to charge a lot of devices including portable devices are transformers (transform an input Voltage to a different Voltage, a higher input Voltage e.g. 100-240V to a lower Voltage e.g. 5V for USB-charged devices). The inverse of an transformer is called Inverter transformer and it does the opposite: a lower Voltage input is converted to a higher Voltage output (e.g. power inverter car 12V to 110V).
Basically inside an adapter there's two coils (called primary and secondary). In the transformers the primary (coil) have an Input Voltage of 110V (for example) and output Voltage of 5V. To lower the Voltage the primary coil must have more windings than secondary Coil. Due to this, the primary coil will generate a magnetic field that will provide current to the another side, the voltage will be less because of the fewer number of windings on this side.
Power and Current are correlated:
So, the transformer is designed to produce and support a power due to wires specifications and the mixed-Iron core variations... This power is determined from the output stage (secondary coil), or in our example, 5V. Using yours adapter's current output (2A) it will provide a power source up to 10W (guaranteed from the manufacturer) because of the Power equation P = V*I
After this the primary is designed to support (same wires and mixed-iron core specification and variations) the same power in Watts. In our case a 110-240V input will support 10W if the max current do not pass over 0.909A or 90mA. This is obtained by the equation I = P / V; and you get the worst value (110V gets a bigger current) to guarantee that your circuit will function properly on specified sheet.
However, due to variations over electrical sources, the 110V variate between 110V and ~= 127V because RMS measurements, the input current is calculated as the mean of 110 and 127 = 118.5V and then you will get almost 0.85A or 85mA with this Voltage.
knowledge sources:
http://en.wikipedia.org/wiki/Transformer
http://www.eeherald.com/section/design-guide/circuit-design.html
https://en.wikipedia.org/wiki/Root_mean_square
http://en.wikipedia.org/wiki/AC_power
Related
Hi all,
I have various chargers at home for the various pieces of kit we have.
My Asus Transformer tf101 has a charger which outputs at 15V, 1.2A
We have other chargers for phones & another tablet all with usb sockets on them.
An HTC outputs 5V, 1A
An Alcatel outputs 5V, 350mA
A Lenovo outputs 5V, 1.5A
Can anyone confirm my understanding about which charger to use and when, please?
I believe that if I use a charger with a LOWER voltage & amerage output than that delivered by the dedicated device charger, that it will NOT damage the device I charge with it - but it will probably take longer to charge. Is this correct?
So I shouldn't use my tf101 charger with anything other than my transformer tablet because it is 15v. But would it be OK to mix any of the other chargers around as they are all 5V? EG could I safely use the HTC charger on the Lenovo? Does the output amperage figure matter, or just the voltage?
Presumably I could use the 5V chargers on the tf101 - but it would take 3 times longer to charge? Could I use the Lenovo charger on the tf101 or would the higher amperage damage the transformer, even though the voltage is lower.
Advice please, helpful members
janner43 said:
I believe that if I use a charger with a LOWER voltage & amerage output than that delivered by the dedicated device charger, that it will NOT damage the device I charge with it - but it will probably take longer to charge. Is this correct?
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This is my understanding: I believe it to be correct, but I may be wrong.
You must match voltages, if you use a charger with too low a voltage, it won't damage the device, but it won't work either. If it's too high, that would potentially damage the device and not work.
You need not match amperages (current) but in order for it to work correctly, you must use a charger greater than or equal to the rated current, eg., if the device wants 3A and you supply 5, this _should_ be OK, as the device only draws 3. But if it's _too_ high and you may exceed cabling tolerances, as the cables are only designed to handle current up to a certain amount, but I won't worry about this unless you're intending to supply currents >10A, say.
You can't charge a 15 volt device with 5 volts you could leave it charging for a million years and it would still only be 5 volts.
You can't charge a 5 volt device with 15 volts or you will cook the electronic components inside.
Another thing to remember the plugs used for different devices will be different sizes. The charging voltage's are usually direct current (DC) with a positive and a negative so you must make sure that the connections are correct.
As for the current rating's of the other chargers my experiance has showed me that isn't quite as important, as the current rating listed on the label is the maximum current that the power supply should have taken out of it.....
If you need to know more about basic electronics there is plenty of sources of information if you search Google.
Sent from my HTC Legend using XDA App
You should always use a charger with same volts of the stock one. The amps is relative, it will determine how fast it "delivers" the current, so the greater it is, the faster it charges...
I bought my G2X used and it didn't come with an AC charger. I've been using another charger I have from a LG phone (STA-U12WD) that is 5.1V and 0.7A. Was looking for a replacement and I read on an Amazon review that the original charger is a STA-U13WV 4.8V and 1A.
Can someone check their charger for me? Thanks.
You'll want both a high amperage and high voltage. Look for a 5 volt (or 5.1) and 1 amp charger.
Think of it like a water hose. Voltage is the pressure, amperage is the width of the hose. So higher width and higher pressure gets the most water. Also note that lowering the width of the hose increases the pressure.
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hey redmonke, do you own the original charger? Can you check the model #?
and if you recommend a charger with higher amperage or voltage what are the limits?
spitswap said:
hey redmonke, do you own the original charger? Can you check the model #?
and if you recommend a charger with higher amperage or voltage what are the limits?
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Click to collapse
I have the original charger that came with my T-Mobile G2x:
Model #: STA-U13WV, Output 4.8v, 1.0a
In my car I use a 5 volt 2 amp charger (though I'm not sure if it's 5 volt split across 2 outputs or if it's for one output, I'll need to test when I get back from university) . Look for 5 volt 1 amp on Amazon with good reviews.
I currently use a cheap 5 volt 700mA charger and it's alright, though it's not the fastest.
Sent from my LG-P999 using XDA
andrewNY said:
I have the original charger that came with my T-Mobile G2x:
Model #: STA-U13WV, Output 4.8v, 1.0a
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thanks man!
I use an apple charger. I also have a charger that can charge a battery and has a USB output of 5.2v @ 800Mah. I'm a little concerned of the 5.2v, I don't want to use it and 6 months later my phone stops charging or worse.
Hi guys,
My friend recently got a Note II. It comes bundled with official Samsung charger with output capacity of 5V ~2A. Just wanted to ask if it is safe to charge our phone using the high capacity charger?
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emanoj.i9103 said:
Hi guys,
My friend recently got a Note II. It comes bundled with official Samsung charger with output capacity of 5V ~2A. Just wanted to ask if it is safe to charge our phone using the high capacity charger?
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not sure but i would prefer you not to use it.
the higher current output would surely decrease he battery life.
your touchscreen might get messed up while charging (if that happens then surely don't do it)
and in worst case, the battery might blast...
I use an HTC charger (because of the very good and practical structure of usb cable and charger) the output of which is 5V and 1A compared to Samsung's 0.7A. Normally it will not brick your phone and it'll even charge faster because of the higher amount of electricity delivered through the cable. By the definition of performance (which is the energy delivered in a unit of time), you see that the higher the electric current is, the higher the performance is. I'm sure that the battery and device will heat up. So all in all, you can try it as the voltage output is the same, but be aware! And keep an eye on the temperature!
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Adam77Root said:
I use an HTC charger (because of the very good and practical structure of usb cable and charger) the output of which is 5V and 1A compared to Samsung's 0.7A. Normally it will not brick your phone and it'll even charge faster because of the higher amount of electricity delivered through the cable. By the definition of performance (which is the energy delivered in a unit of time), you see that the higher the electric current is, the higher the performance is. I'm sure that the battery and device will heat up. So all in all, you can try it as the voltage output is the same, but be aware! And keep an eye on the temperature!
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That is one hell of an analysis!:good:
Thanks a lot Adam. I'll try charging with an eye on temp.
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Lols.. I m surrounding with Sony, LG, HTC & my own Note 2 handset. but I usually charged from everybody's charger. But yes Adam did lots of research & as he said when I charge my mobile using Note 2 charger, it get charged fast then R's one. so, thinking to keep only Note 2 charger now.
Adam77Root said:
I use an HTC charger (because of the very good and practical structure of usb cable and charger) the output of which is 5V and 1A compared to Samsung's 0.7A. Normally it will not brick your phone and it'll even charge faster because of the higher amount of electricity delivered through the cable. By the definition of performance (which is the energy delivered in a unit of time), you see that the higher the electric current is, the higher the performance is. I'm sure that the battery and device will heat up. So all in all, you can try it as the voltage output is the same, but be aware! And keep an eye on the temperature!
Sent from my GT-I9103 with CM10
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Are you a student of electronics / related branch by any chance ?
Woh Science ki taraf se hai...
Translation: He's from the science side...
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I don't go to sleep until I utilize my quota of 8 thanx a day!
'cooleagle' said:
Are you a student of electronics / related branch by any chance ?
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Here goes my observations, I used Note II charger to charge R. It does charge faster than the stock charger. Also, as adam said, phone got little heated up too.
Offtopic: I did my bachelors in electronics. I asked the question coz I didn't bother to know about hardware internals and wanted to know if there's some overcharge protection built in...
Thanked you for the thought about electronics. Cheers!
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No, I go to a class which specialises in maths and physics. I'm interested in electronics and do researches mainly in free time. It's one of the best parts of physics for me.
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Guys can someone tell me a good charger for my i9000. My original charger was bricked and now im using chines charger but it get lot of time to charge...
If someone help me i definitely HIT THANKS....
Buy an original charger.
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You just need one with a higher output current. I forgot what current the OEM one has, but you want one that has an equal or higher current output. Don't worry about overcharging your phone. It has a chip that limits the maximum current it can receive.
Hello,
the caracteristic of original are: 5V - 0.7A
But some china's power supply marked 1A rely deliver less...
If you can buy an original!
snapper.fishes said:
You just need one with a higher output current. I forgot what current the OEM one has, but you want one that has an equal or higher current output. Don't worry about overcharging your phone. It has a chip that limits the maximum current it can receive.
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Is this true? im afraid of charging my phone with 500mA charger?
So can i charge it with 500mA?
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higgins91 said:
Hello,
the caracteristic of original are: 5V - 0.7A
But some china's power supply marked 1A rely deliver less...
If you can buy an original!
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Click to collapse
Yeah, if you buy a no-name Chinese USB supply then you either get your phone plugged straight into the mains or the circuits and components of nightmares.
Edit:
dhurk said:
Is this true? im afraid of charging my phone with 500mA charger?
So can i charge it with 500mA?
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As far as safety, current doesn't matter. At 500mA you'll be charging pretty slowly though.
i use 2A charger from TomTom and working fine even with working GPS navigation and still can charge to 100%.
Im curious if I can use the extraordinarily large USB cable from the nexus 7 coupled with my m8s wall plug and get the same charging speeds from the higher amp charging wall plug? I only ask because HTC makes some pretty short cables and hinders my internet browsing at night abilities :good:
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Not at all. Charge away!
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godhamba said:
Not at all. Charge away!
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Length of dc wire will lead to voltage drop. Lower voltage means the unit will draw more amps to get the same wattage of power. If anyone needs a longer cable make sure it's not cheap and that it uses a heavier gauge USB cable. Unless you are fan of heat in both your charger and phone.
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Yes, but we are talking a foot or two at most here; the voltage drop would be inconsequential.
dottat said:
Length of dc wire will lead to voltage drop. Lower voltage means the unit will draw more amps to get the same wattage of power. If anyone needs a longer cable make sure it's not cheap and that it uses a heavier gauge USB cable. Unless you are fan of heat in both your charger and phone.
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godhamba said:
Yes, but we are talking a foot or two at most here; the voltage drop would be inconsequential.
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Depends. I have seen some pretty crazy six and ten foot cables lol. The user then wonders why the slow charge.