Question 1 of 27070
Q
At a minimum threshold, how many milliamps of current through the body produces a condition where most people would be unable to let go of the energized electrical conductor due to involuntary muscular contraction?
A
3 to 7 mA
B
10 to 16 mA
C
30 mA
D
75 mA for 5 sec.
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Question 1 / 270705eccefa3bacbc34ba4d47e66
Question 1 of 270705eccefa3bacbc34ba4d47e66

At a minimum threshold, how many milliamps of current through the body produces a condition where most people would be unable to let go of the energized electrical conductor due to involuntary muscular contraction?

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Question 1 of 27070
Q

At a minimum threshold, how many milliamps of current through the body produces a condition where most people would be unable to let go of the energized electrical conductor due to involuntary muscular contraction?

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šŸ” Key Concepts

ā€¢ Let-go current: the current at which a person can no longer voluntarily release an energized object ā€¢ Difference between perception threshold (you can feel it) and pain/lock-on threshold (you canā€™t let go) ā€¢ How increasing milliamps (mA) affects muscle control vs. just sensation

šŸ’­ Think About

ā€¢ Which choice best matches the point where hand and forearm muscles contract so strongly that voluntary release is no longer possible for MOST people? ā€¢ Look at the lowest range where loss of muscular control is typically reported, not just feeling a tingle or mild pain. ā€¢ Compare the numbers: which range is commonly cited in safety materials as the ā€˜let-goā€™ threshold for 60 Hz AC current through the body?

āœ… Before You Answer

ā€¢ Verify which mA range is associated with ā€˜let-goā€™ or ā€˜involuntary muscle contractionā€™, not fibrillation or severe burns. ā€¢ Eliminate options that are clearly in the just noticeable / mild shock range. ā€¢ Eliminate options that describe more severe effects (like respiratory arrest or VF) rather than the first point where the person canā€™t let go.