Charger Issues (Alternate Charger)

[pedro_]

The thickness of the wire _may_ affect the charging speed.

Charging depends on the voltage applied to the battery, very thin wire will drop part of the 5v supplied by the charger so the current flow could be lower.

The Usb2 spec says a host should be able to supply 900mA. The business about 2 volts on the data leads is all about detecting if there is a client device attached that is using the data leads ie passing data. Where no data is present the charger should be able to supply 1.8 A, this cludge is so that you don't connect a device that drags down the 5v whilst another device - for example a GPS - requires the full 5v

Pete

Sent from my IDEOS S7 using Android Tablet Forum

 

[skoster]

The thickness of the wire _may_ affect the charging speed.

Charging depends on the voltage applied to the battery, very thin wire will drop part of the 5v supplied by the charger so the current flow could be lower.

Nope, the wire is in serial with the rest of the circuit, so the amperage will be the same through the wire as through the in-device charging circuit. Amperage divides in parallel, voltage divides in serial.

 

[pa49]

The thickness of the wire _may_ affect the charging speed.

Charging depends on the voltage applied to the battery, very thin wire will drop part of the 5v supplied by the charger so the current flow could be lower.

The Usb2 spec says a host should be able to supply 900mA. The business about 2 volts on the data leads is all about detecting if there is a client device attached that is using the data leads ie passing data. Where no data is present the charger should be able to supply 1.8 A, this cludge is so that you don't connect a device that drags down the 5v whilst another device - for example a GPS - requires the full 5v

Pete

Sent from my IDEOS S7 using Android Tablet Forum[/QUOTE

I always thought that USB2 was 500mA and USB3 was 900mA

But maybe Wikipaedia is wrong but read the Power section.

Any circuit attempting to draw a current over an inferior spec cable for the job will result in "lost" power in the form of heat. This risks damage to cable and charger circuits the whole thing would act like a fuse and something would give somewhere and it will be at the weakest point. Fuses blow due to the melt down caused by heat and any thin wire can have this happen with the drawing of too great a current.

skoster-
"you'll burn the wire up if you try to run too much amperage through wire which cannot handle it"
Current is drawn not run!
But you knew that.