Re: Cell Phone Charging

On 8 Apr 2025 at 21:24:43 BST, "Ed Vance" <Ed Vance> wrote:

When I was in High School I took a  Electric class.
There was a 6Volt Battery , some assorted length wires with battery clips on
each end and some homemade Resistors with wire wrapped around a strip of
Bakelite.
The Teacher gave us Schematics showing Series,circuit to calculate the Voltage
and Current we should get when we assembled the circuit and then used a VOM to
see the readings on the circuit.
 
We were told to ALWAYS wire the circuit up first , connect the VOM and then put
the battery clips on the battery.
 
When I charge my ell phone I put the USB C plug in the jack on the phone and
then plug the other end in the A.C. socket.
 
When it is charged up I unplug the A.C.  plug from the socket and remove the
USB C plug from the phone
 
I know it is only 5 Volts but I do it that way.
 
Most folks I see unplug the wire from their phone first , then unplug the A.C.
end.
 
Probably doesn't matter, but I'm set in my ways
Ed

Some interfaces are designed to be hot plugged and some aren't. USB is one of
those that is. However, if your cell phone is currently(sic) charging at
several amps as some of them do nowadays then it seems highly undesirable to
unplug the charging lead because of the risk of arcing at the contacts as they
are broken. When it has stopped charging it probably doesn't matter, as usb is
designed for this.

--

Roger Hayter