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In the allaboutcircuits.com online textbook "Lessons on Electric Circuits Volume 1 DC", I noticed a couple errors. One of them pertains to safety.
Both errors are in Chapter 3 "Electrical Safety" section 3.2 "Physiological effects of Electricity"
1st error:
In chapter 3 section 3.2 the text says, "Low-frequency AC produces extended muscle contraction (tetany), which may freeze the hand to the current’s source, prolonging exposure. DC is most likely to cause a single convulsive contraction, which often forces the victim away from the current’s source."
Then a couple paragraphs later in the review section it states, "Direct current (DC) is more likely to cause muscle tetanus than alternating current (AC), making DC more likely to ”freeze” a victim in a shock scenario. However, AC is more likely to cause a victim’s heart to fibrillate, which is a more dangerous condition for the victim after the shocking current has been halted"
Unless I'm misunderstanding something, it appears that one states that AC is more likely to cause tetany and freeze the hand while the other states that DC is more likely to cause tetany and freeze the hand.
2nd error:
A few paragraphs earlier in chapter 3 section 3.2, it states, "This principle has been applied in ”stun gun” devices such as Tasers, which on the principle of momentarily shocking a victim with a high-voltage pulse delivered between two electrodes." I imagine this is supposed to state, "which operate on the principle of...."
Both errors are in Chapter 3 "Electrical Safety" section 3.2 "Physiological effects of Electricity"
1st error:
In chapter 3 section 3.2 the text says, "Low-frequency AC produces extended muscle contraction (tetany), which may freeze the hand to the current’s source, prolonging exposure. DC is most likely to cause a single convulsive contraction, which often forces the victim away from the current’s source."
Then a couple paragraphs later in the review section it states, "Direct current (DC) is more likely to cause muscle tetanus than alternating current (AC), making DC more likely to ”freeze” a victim in a shock scenario. However, AC is more likely to cause a victim’s heart to fibrillate, which is a more dangerous condition for the victim after the shocking current has been halted"
Unless I'm misunderstanding something, it appears that one states that AC is more likely to cause tetany and freeze the hand while the other states that DC is more likely to cause tetany and freeze the hand.
2nd error:
A few paragraphs earlier in chapter 3 section 3.2, it states, "This principle has been applied in ”stun gun” devices such as Tasers, which on the principle of momentarily shocking a victim with a high-voltage pulse delivered between two electrodes." I imagine this is supposed to state, "which operate on the principle of...."
