Timeline for What is electromotive force? What's its relationship to Voltage? + clarification of confusion
Current License: CC BY-SA 4.0
4 events
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| Jun 2 at 17:02 | comment | added | Ján Lalinský | @Manuel The concept is clear, it is line integral of force per unit charge along given path, thus closely related to work done on electric charge. Because there are many forces, there can be many different EMFs. Often EMF refers to integral of net force minus the electrostatic component (thus all forces other than sum of Coulomb's forces of charged particles in the system), this is the case in battery (battery EMF) or induced EMF, or motional EMF. But many people including teachers do not understand this, Sydney Ross just described the terrible state of teaching. See e.g. Farcher's answer. | |
| Jun 2 at 9:56 | comment | added | Jos Bergervoet | You should ask your school... (It could be in a kind of historical overview, but then as a teacher I would stress that people in those days were still struggling to define the laws, whereas now we have clear prescriptions of how the $E$ and $B$ fields, the Lorentz force, and the potentials are exactly defined. So that's what you should use!) | |
| Jun 2 at 9:51 | comment | added | Manuel | Hmmmm, I see. Though, why do they teach us this concept at school if it is so inconsistent? Like, in the expression: $\varepsilon I =RI^{2}+UI$ , as I said in my question, this means $UI=UI+UI$ . This cannot be true. How are we supposed to accept this formula without having a notion of what the electromotive force is? And if it is so inconsistent, how can it be used numerically as a quantity? There has to be a concrete definition of what it is, and how it relates to voltage. | |
| Jun 2 at 9:44 | history | answered | Jos Bergervoet | CC BY-SA 4.0 |