Practice English Speaking&Listening with: Apple vs Blitzwolf vs Xiaomi - popular chargers current and voltage test

Hello youtube, so these are the chargers I am gonna test today; first one was

Blitzwolf, this one is Xiaomi power bank, this is Apple charger, it's for iPhone 5S, the next one is the charger

which came with Chinese tablet, this one is from my camera and the last one is from Doogee phone

so because we are testing 5V chargers, according to Ohm's law we have to apply 2 ohms of resistance to draw

2.5A from the charger, I didn't have 2 ohm high power resistors, I had to solder

some resistors in series

I will use this simple power meter which displays voltage and current

first device tested is Xiaomi 10.4Ah power bank, it's very popular, it has a lot

of clones as you can see in one of my videos where I pour sand from cells extracted

from fake power bank like this

so the Xiaomi says it will provide 2 amps at 5 volts, it gives over 2 amps

it is almost 2.5 amps which is more than expected

Apple provides this charger with iPhone 5S, it is rated at 2.4 amps at 5.2 volts

which is about 12 watts of power

voltage drop of .4 volts and 2.4 amps gives us about eleven and a half watts which is close enough

Chinese tablet charger, I didn't expect much from this, the build quality is really crappy

quite high voltage at idle

but as you can see the charger is quite capable, voltage drop is minimal, it gives 2.6 amps

which is about 13.2 watts, it's really nice

this one is another Chinese charger build quality is probably the worst from

all the chargers I'm testing in this video

quite high voltage at idle

and huge voltage drop to 3 volts, which is unacceptable

you probably won't charge a cell phone with it, a smartphone or a tablet, is probably won't even start charging

very small charger from Doogee phone, it's very lightweight, it's the lightest from all the chargers I am testing

build quality is not bad, plastic is... looks really cool

so we have exactly five volts at idle

and the display switches off, there is a diode in the display so

probably voltage drop is too much for the diode to even start

you can see it rises from 3 volts, so probably voltage drop is below 3 volts

it's actually crap

the last charger for today, this one has two ports, this is why I had to build two rigs for testing the chargers

it's blitzwolf, it's rated

at double 2.4A

first I am gonna test single port performance

it is 5.2V at idle

voltage drop is quite significant, it's over half volt, but the charger gives 2.4 amps as rated

so this needs some explaining, I didn't have two

meters, two USB meters, so I had to use regular current meter I connected the resistors in series with

the meter, you can actually see current draw right now, it's 2.26A and I'm

connecting the second power meter which draws almost two and a half amps so both

ports are now at load, voltage drop is minimal, first port gives 2.5 amps, the second one

gives 2.35, so the power output matches the declared power output on the

charger and if you multiply current by voltage you get almost exactly what blitzwolf says

the charger delivers

there's one thing I have to mention though, all chargers connected to the electricity outlet the

make high pitch noise, in one charger this noise is not bad, in the other

like blitzwolf, when you use just one port the high pitch noise is really annoying

quietest of these charges is the apple charger, I will probably do another test where I

just test the noise of the chargers

so thanks for watching, please subscribe and share the video, see you next time, bye