Editing 643: Ohm
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==Explanation== | ==Explanation== | ||
| − | This comic deliberately [https://en.wiktionary.org/wiki/conflate conflates] the origin story of the comic-book superhero of {{w|Spider-Man}} with the origin of {{w|Ohm's law}}, as both the origin story of | + | This comic deliberately [https://en.wiktionary.org/wiki/conflate conflates] the origin story of the comic-book superhero of {{w|Spider-Man}} with the origin of {{w|Ohm's law}}, as both the origin story of spider-man and Ohm's law deal with power, though the power is of different types. |
| − | In the origin story of | + | In the origin story of Spiderman {{w|Peter Parker}} (who would become Spider-man) is raised by his Aunt May and Uncle Ben. When Parker goes through various stages of teenage angst and rebellion, his {{w|Uncle Ben}} (in different situations depending on the comics and/or movie) advises him that "with great power comes great responsibility". Here, power is taken by the reader to refer to Parker's superhero powers, acquired from a bite from a radioactive spider and via various technologies Parker designs himself. It is to be noted, however, that Uncle Ben doesn't know about these powers in the origin stories and only means this as general advice. |
In contrast, in this xkcd comic, Ohm's law is supposedly delivered to {{w|Georg Ohm}} by a similar authority figure in the form of relating current and resistance to power (in the unit of {{w|Watt}}s), where power is defined as the change in energy per unit time. In real life, Ohm obviously was never "advised" about the law but instead determined experimentally that current through an Ohmic resistor was proportional to the {{w|voltage}}. | In contrast, in this xkcd comic, Ohm's law is supposedly delivered to {{w|Georg Ohm}} by a similar authority figure in the form of relating current and resistance to power (in the unit of {{w|Watt}}s), where power is defined as the change in energy per unit time. In real life, Ohm obviously was never "advised" about the law but instead determined experimentally that current through an Ohmic resistor was proportional to the {{w|voltage}}. | ||
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:which leads to the power equation alluded to in the comic. | :which leads to the power equation alluded to in the comic. | ||
| − | The joke here is that given the proportionality, by definition a great (amount of) power would involve a great (amount of) current and/or resistance (squared), as here the phrase 'great power' could be taken to mean 'a large capability to do things' or 'a numerically large quantity of (electrical) power'. There is also humor in the improbability of this scenario, the comparison with Spider- | + | The joke here is that given the proportionality, by definition a great (amount of) power would involve a great (amount of) current and/or resistance (squared), as here the phrase 'great power' could be taken to mean 'a large capability to do things' or 'a numerically large quantity of (electrical) power'. There is also humor in the improbability of this scenario, the comparison with Spider-man, as well as the suggestion that it was how Ohm derived his eponymous law. |
The title text takes this further, by redefining the power equation as a more generalized {{w|differential equation}}, which simply states that power is proportional to the change of energy per unit time (dE/dt), which is another way of stating that "power = energy per unit time". In many engineering and physics books the differential form is presented as the general form from which a specific algebraic form can be derived as the differential form is more adaptable to special cases, and therefore more general, and so the title text extends the conflation of physical power and electrical power to a more generalized form. | The title text takes this further, by redefining the power equation as a more generalized {{w|differential equation}}, which simply states that power is proportional to the change of energy per unit time (dE/dt), which is another way of stating that "power = energy per unit time". In many engineering and physics books the differential form is presented as the general form from which a specific algebraic form can be derived as the differential form is more adaptable to special cases, and therefore more general, and so the title text extends the conflation of physical power and electrical power to a more generalized form. | ||
