Question 53Electricity/Electronics - Assistant Engineer70% to pass
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?
AI Explanation
The correct answer is B) 10 to 16 mA.
The range of 10 to 16 milliamps of current through the body is the minimum threshold where most people would be unable to let go of an energized electrical conductor due to involuntary muscular contraction. This is based on the generally accepted physiological effects of electric current on the human body. Currents in this range can cause muscular paralysis, preventing the victim from being able to release the conductor.
The other options are incorrect because 3-7 mA is considered the "let-go" threshold where most people can still voluntarily release the conductor, 30 mA is higher than the involuntary muscular contraction range, and 75 mA for 5 seconds is a much higher current that can lead to more severe injuries beyond just the inability to let go.
Related Questions
#51 At a minimum threshold, how many milliamps of current through the body produces a condition where most people would suffer ventricular fibrillation and could only be resuscitated with a ventricular defibrillator? #52 Before electrical work can be safely undertaken, the equipment must be de-energized, locked and tagged out, and verification must be made that the circuit is actually dead. What testing device is most certain to reliably verify that a circuit is actually dead? #54 Which of the following voltage testers would be associated with high quality, be safe to use, and minimize the electric shock hazard? #55 With all other factors considered equal (such as voltage, conducting path through the body and the duration of contact), contact with an energized electrical system conductor of which system type would produce the most damaging effect? #56 At a minimum threshold, how many milliamps of current through the body produces a painful sensation that most people would perceive as an electric shock?