From: roger@hayter.org   
      
   On 8 Apr 2025 at 21:24:43 BST, "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   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)