What is the "threshold of feeling" current level at 60 Hz from hand to hand?

The "threshold of feeling" current level at 60 Hz from hand to hand is typically around 1.0 mA. This is the minimum amount of electrical current that a person can perceive when it passes through the body, specifically across the hands, at this frequency.

Understanding the threshold of feeling is crucial for safety in biomedical equipment applications, as it helps define the boundaries for safe current levels when patients are in contact with electrical devices. At levels higher than this threshold, sensations such as tingling may occur, and this can become more serious with increased current levels, leading to muscle contractions and potentially harmful physiological effects.

In the context of this question, while other values represent varying levels of current that could be felt or experienced in different ways (like muscle contractions or pain), 1.0 mA is specifically recognized for its association with the threshold of feeling, making it the correct and relevant choice for this context.