Timeline for In Ohm's Law, why do we not take the constant of proportionality as $\dfrac{1}{R}$?
Current License: CC BY-SA 4.0
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| Apr 30, 2020 at 19:29 | history | edited | Qmechanic♦ | CC BY-SA 4.0 |
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| S Apr 30, 2020 at 16:16 | history | suggested | user245539 | CC BY-SA 4.0 |
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| Apr 30, 2020 at 16:03 | review | Suggested edits | |||
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| Apr 30, 2020 at 6:50 | comment | added | Oscar Bravo | @ThePhoton Of course the units are arbitrary and you could make any units you like. The point the OP is making is that the actual units we use, Volts and Amps, happen to have typical values in benchtop electronics that lead to resistance values (in Ohms) that are big numbers (resistorguide.com/resistor-values). He was wondering about using the inverse (conductance) instead. Don't know why... | |
| Apr 29, 2020 at 14:59 | comment | added | The Photon | But our choice of units is arbitrary. 1 amp is 1000 milliamps. So is 1000 mA more or less than 5 V? It would also be just as valid to make up a new current unit called the Rajdeep, such that $1\ {\rm A}=5.2\times 10^6\ {\rm Rd}$. Now is 5.2 million Rd more or less than 5 V? | |
| Apr 29, 2020 at 14:52 | history | edited | Qmechanic♦ |
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| Apr 29, 2020 at 14:43 | comment | added | Rajdeep Sindhu | @OscarBravo Exactly | |
| Apr 29, 2020 at 14:42 | comment | added | Oscar Bravo | I think what you're getting at is that in a typical bench-top electronics circuit, the voltage (measured in Volts, e.g., 5V) is usually larger than the current (measured in Amps, e.g. 0.1A), so that the Resistance (measured in Ohms) is a biggish number (e.g., 50$\Omega$). Of course, this depends on the application. When you're starting your car, the 12V from the battery is a smaller number than the few hundred Amps that flow (which implies a resistance of a small fraction of an Ohm). | |
| Apr 29, 2020 at 14:09 | vote | accept | Rajdeep Sindhu | ||
| Apr 29, 2020 at 14:04 | comment | added | Rajdeep Sindhu | I thought magnitude is a pure number. Like if we say $1$ $ampere$, the magnitude is $1$ and the unit is $amperes$. | |
| Apr 29, 2020 at 14:01 | comment | added | BioPhysicist | Yeah, that still doesn't work. Magnitudes have units also. | |
| Apr 29, 2020 at 13:59 | comment | added | Rajdeep Sindhu | @AaronStevens What I was comparing was magnitude of current and voltage | |
| Apr 29, 2020 at 13:57 | answer | added | BioPhysicist | timeline score: 5 | |
| Apr 29, 2020 at 13:53 | comment | added | BioPhysicist | How can current be less or more than voltage? They are different things. That's like saying I can run faster than the volume of my water bottle. | |
| Apr 29, 2020 at 13:47 | history | asked | Rajdeep Sindhu | CC BY-SA 4.0 |