Re: [Phys-l] RC Discharge

[<carmelo@pacific.net.sg>]

Mike wrote
> I also agree with all four of Bob's diagrams.  However, please note that 
> the thing that got me off on this was my son asking about Serway/Jewitt. 
> The Serway/Jewitt diagram is *exactly* Bob's third diagram.  (Same 
> capacitor placement, same resistor placement, same +/- signs on 
> capacitor, same current arrow.)  But the Serway analysis is -q/C - IR = 
> 0 and I = +dq/dt.

The Touchpads operate by sensing the capacitance of a finger, and the fingers get charged and discharged and sometimes one may feel uncomfortable? Perhaps, we can use these equations to explain the senations of fingers...


Alphonsus