At a minimum threshold, how many milliamps...

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?

Back

Question 1 of 27070

🔍 Key Concepts

• Let-go current: the current at which a person can no longer voluntarily release an energized object • Difference between perception threshold (you can feel it) and pain/lock-on threshold (you can’t let go) • How increasing milliamps (mA) affects muscle control vs. just sensation

💭 Think About

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

✅ Before You Answer

• Verify which mA range is associated with ‘let-go’ or ‘involuntary muscle contraction’, not fibrillation or severe burns. • Eliminate options that are clearly in the just noticeable / mild shock range. • Eliminate options that describe more severe effects (like respiratory arrest or VF) rather than the first point where the person can’t let go.