Transcript Example Using Low Voltage DC

Example Using Low Voltage DC
A person accidentally grabs conductors connected to each end of a dc
voltage source, one in each hand.
a) What is the minimum source voltage that can produce electrical
shock sufficient to cause paralysis, preventing the person from letting
go of the conductors?
RA  400
RT  50
RL  200
I min  50mA
Vmin  I min ( RA  RA )
Vmin  (50  103 A)(800)
Vmin  40V
b) Is there a significant risk of this type of accident occurring while
servicing a personal computer which typically has 5V and 12V
sources?
No. Considering 12V as the worst case,
12V
I
 15mA
800
The 15 mA current would cause a mild shock.