# Recent content by FS98

1. ### B Current in a circuit

Just in general when we talk about voltage in ohms law. Can it be between points or between non-points? What is voltage if we’re not referring to single points? I’ve understood voltage to be a difference in electrical potential between two points.
2. ### B Current in a circuit

Is voltage always measured between theoretical points? Also, if the physical dimensions of the wire don’t matter when finding this sort of thing, why are wires treated as infinityley thin in circuit analysis? I would think that there wouldn’t be a size assigned if it was trivial.
3. ### B Current in a circuit

But if the amount of charge flowing through a given point per unit time was .5A, wouldn’t the amount of charge flowing through a cross section be infinite because there are an infinite number of points on the cross section?
4. ### B Current in a circuit

How can it be both? If there was a certain finite amount of charge flowing through the cross section of a wire wouldn’t the amount of charge flowing through a point on that cross section have to be nearly 0? Also sorry for the similar post, I realized that I was still a bit confused on this...
5. ### B Current in a circuit

If we measure the voltage in a simple series circuit to be 5v and the resistance to be 10 ohms. The current given is .5A. Is this the amount of chage traveling from the first point to the second point per unit time, or is it the amount of charge flowing through a cross section of the conductor...
6. ### Coefficient of kinetic friction lab

I believe the a would come from the fact that F = ma. Replace F with M1a on one side and with M2a on the other. I think we can also get rid of T by substitution.
7. ### Coefficient of kinetic friction lab

Homework Statement I need to find the coefficient of kinetic friction from a set a lab data that I found. I had a mass connected to a mass hanger by a pulley, and measured the acceleration of the mass with various amounts of mass on the hanger. In the attached image, the acceleration was...
8. ### B Meaning of Current in Ohm's law

So if R is the resistance between a point at the beginning and at the end, and V is a voltage between a point at the beginning and at the end, V/R would be the current coming from the beginning and entering the end of the circuit? It can’t be the current along the entire path between the two...
9. ### B Meaning of Current in Ohm's law

If we had a parallel circuit with a voltage of V between the beginning and end, and the circuit has a resistance R, then the current given by ohms law is I = V/R. What does this mean? The current is not the same throughout the whole circuit. Where is the current equal to this value?
10. ### I Improper integrals

Wouldn’t that definition of an integral rule out definite integrals as integrals?
11. ### I Improper integrals

I understand what improper integrals are, but are they really integrals? The semantics are just a bit confusing.
12. ### B Ohmic and non-Ohmic conductors

But aren’t there ways to find resistance without measuring it? So at any instant, the value of R would have to be a single value based on resistivity, length and area? The statement seems stronger than just saying that there exists some current and some voltage.
13. ### B Ohmic and non-Ohmic conductors

Do ohmic conductors obey ohms law at high voltages? Also, I’ve seen it explained that some conductors are non-ohmic because the temperature caused by the current changes the resistance in the circuit. If that’s the case, isn’t ohms law still being obeyed, just with a varying resistance.
14. ### B Voltage drop over a resistor

So is there no force on the charge carriers while going through a wire, but some force on charge carriers going through a resistor. And if so what is the cause of that force.
15. ### B Voltage drop over a resistor

why does it have to do either? If you push a block with a constant velocity along a frictional surface, energy is being lost similarly to in the resistor. But the block doesn’t gain or lose any kinetic or potential energy as it’s pushed. Is this situation not analogous to current through a...