Have always wondered this.
Why can I touch a 7VDC 140A system with no problems, but 120V with less than a mA can kill?
In: Physics
One thing to keep in mind, high current low voltage sources can be very dangerous as well, but for different reasons.
They can pose a high arcing hazard, and accidental shorts can be more dangerous because of the high current availability. These sources expect to see high current, so if a fault occurs that causes high current it can be more difficult to detect and clear it because the source can deliver it all day long.
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