Which of these is the SMALLEST current that can be fatal under certain conditions?

The smallest current that can be potentially fatal under certain conditions is 1/10 of 1 amp. This value is significant because electrical safety studies have shown that currents as low as 0.1 amp (or 1/10 of an amp) can be dangerous and possibly lethal. The human body has a threshold for electrical current that, when exceeded, can disrupt normal heart function and lead to conditions like ventricular fibrillation, which is a chaotic heart rhythm that can be fatal if not treated immediately.

The danger of electrical current does not solely depend on the magnitude of the current but also on various factors, including the path the current takes through the body, the duration of exposure to the current, and the specific health conditions of the individual. Thus, even relatively small currents can have severe consequences, emphasizing the critical nature of understanding electrical safety. This is why 1/10 of 1 amp is highlighted as particularly significant in the context of electrical shock hazards.