How USB Cables Affect Charging – Simple Test
I came across an interesting article today from Dr Gough, a tech nerd. and thought it good enough to summarize here:
The USB specifications for power from a port vary from 100mA to 1.5A and up to 100W of power for USB Type C, but the cables and connectors used in a cable might not align with the power specifications of the product being designed and used. Cables are typically rated for about 1.8A of current, which is most common for cables used for charging.
The 1.8A rating is based on safety limits for resistive heating of the cable and connectors. The rating is no guarantee your +5V at 1.5A setup will get you the maximum level of power. The important point here, the cable and connector combination is simply a rating to deal with heat, and ensures nothing melts. Going a step further, most specs ensure nothing gets noticeably warm to the human touch.
Every wire that’s not a superconductor has some finite resistance. Said another way, resistance is transferred into heat. Ohm’s law tells says that E = IR, where E is voltage, I is current, and R is resistance. So when you put power through a wire, the current X resistance gives me the voltage that will be “consumed” across that wire, power that turns into heat, and thus, never makes it to your phone.
I want to end this blog post with the above paragraph as that is the real takeaway here. The more inefficient (or cheap) a cable is, the warmer it will get. So if your iPhone cable is warm to the touch, it sucks. If your wire charging your power bank is warm, it sucks. Get a better cable. From what I can tell, there is no rating posted on all these cables you see on Amazon at cheap prices, so word to the wise using your tactile feel!
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This is why I like the 10 port charging station from USBFever. It’s got a logical design for holding ten devices. With the USB ports on the bottom, it keeps the plugs from hanging off the wall. Just above the USB ports are hollow channels you can bundle up the USB cable and stash it away. On top are vertical channels to hold your iPhone, iPad, Smartphone or tablet. The vertical channels are tall enough the devices will sit sturdy and proper.
Finally, the design includes a good balance of power output for the devices. There are a total of 10 USB ports. Eight of which push out a 2.5amp power supply and the remaining two are 1amp. This means the charging dock station will power the tablets as well as the larger iPhone and Samsung product while you can leave the smaller phones to the 1amp channels.
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This post is just an appetizer for all the dirty little secrets related to USB charging devices, to get a little deeper into the details click over to