Editing 1604: Snakes
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In the comic, [[Megan]] confuses a popular method of identification of the dangerous North American {{w|coral snake}} by its red, yellow, and black stripes with the {{w|Electronic color code|color-coding system}} used to indicate the resistance of electrical resistors. | In the comic, [[Megan]] confuses a popular method of identification of the dangerous North American {{w|coral snake}} by its red, yellow, and black stripes with the {{w|Electronic color code|color-coding system}} used to indicate the resistance of electrical resistors. | ||
| − | The coral snake has red bands adjacent to its yellow bands. However, coral snakes are {{w|mimicry|mimicked}} by nonvenomous species with similar coloring, such as the {{w|milk snake}}, whose red bands are not adjacent to its yellow bands. | + | The coral snake has red bands adjacent to its yellow bands. However, coral snakes are {{w|mimicry|mimicked}} by nonvenomous species with similar coloring, such as the {{w|milk snake}}, whose red bands are not adjacent to its yellow bands. This has led to a variety of rhyming {{w|mnemonic}}s, such as “Red touches yellow, kill a fellow; red touches black, friend of Jack.” Because Megan is describing a red band being adjacent to a yellow band, she is indeed holding a coral snake, which contains the most potent venom of any snake in North America. (This assumes, of course, that Randall isn't faking us out; there are other lesser-known subspecies of the coral snake, such as the [http://naturejournals.blogspot.com/2010/05/texas-coral-snake.html Cattinga and Pygmy coral snakes of South America], who do not follow the above patterns.) |
| − | Instead of realizing the danger, Megan equates the color bands to having the same function as those printed on electrical {{w|resistor}}s. Resistors have at least three bands to identify their resistance value in {{w|ohm}}s, followed by an optional fourth band showing the {{w|engineering tolerance|tolerance}} as within the bounds of a certain percentage of the aforementioned resistance value. A red band followed by a yellow and a black one identifies a 24 ohm resistor (the omega symbol, “Ω”, stands for ohms). | + | Instead of realizing the danger, Megan equates the color bands to having the same function as those printed on electrical {{w|resistor}}s. Resistors have at least three bands to identify their resistance value in {{w|ohm}}s, followed by an optional fourth band showing the {{w|engineering tolerance|tolerance}} as within the bounds of a certain percentage of the aforementioned resistance value. A red band followed by a yellow and a black one identifies a 24 ohm resistor (the omega symbol, “Ω”, stands for ohms). Per the mnemonic, North American coral snakes have an additional yellow band between the black band and the next red band, so that red does touch yellow. Yellow corresponds to a tolerance of ±5%, so the actual resistance will be between 22.8Ω and 25.2Ω. Resistor color codes were also mentioned in [[227: Color Codes]]. |
The title text refers to the fourth band specifying the tolerance but interprets it as the snake's tolerance for being held before biting, instead of the measure of the imprecision of the 24 ohms. In the case of yellow, this would refer to a tolerance value of 5%. How tolerance to being held is measured is left ambiguous. If the value represents the probability of being bitten over a given period of time, then larger numbers would mean a less tolerant snake. If it instead represents the position on some per-determined "tolerance scale" between 0 and 1, then larger values would represent a 'more' tolerant snake. | The title text refers to the fourth band specifying the tolerance but interprets it as the snake's tolerance for being held before biting, instead of the measure of the imprecision of the 24 ohms. In the case of yellow, this would refer to a tolerance value of 5%. How tolerance to being held is measured is left ambiguous. If the value represents the probability of being bitten over a given period of time, then larger numbers would mean a less tolerant snake. If it instead represents the position on some per-determined "tolerance scale" between 0 and 1, then larger values would represent a 'more' tolerant snake. | ||
