Hey man i needed help, can you upload a video on how to find the potential between the two points in a little more complicated circuits where there are series and parallel connections? Thanks for this one!
So to clear one thing up, it's important to find the Direction of the current so that when writing the Potential Difference you know to put the greater valued voltage first and the lesser value voltage seconded? I did the second question on my own and had the numbers flipped so I got the wrong answer lol. That aside, thank you. This video was very informative for a beginner!
But electron flow from high voltage to low voltage as high voltage will repel ...so current is opposite the flow of electrin so current direction must be from low voltage to high...explaun
I think the reason he put the two voltage negative, was to distinguish between which voltage value was the greater one since the greater voltage value which is -12V should be subtracted by the smaller voltage which is -30 volt. The more negative a value is, the smaller it is. Difference in Potential = Vlarge - Vsmall = -12V - (-30V) = 18V And then you can just divide the 18V by the value of the resistor and you will get the current.
Just remember this is how we read schematics but in reality the high potential(+) has less electrons than low potential (-) more electrons. Electrons want to go to the high potential to fill in those holes in the valence shell. So a battery provides the energy needed to move the electrons from point a to point b
you didn't really describe what electrical potential was, I understand now how to determine if the flow of current and that the higher side of potential energy will flow to the lower side but i don't know why is does that and your title is "what is electric potential difference". other than that i thought it was a good video :)
Excuse me, there is something i dont understand. The electric potential of the electron is higher at -30v comparing to -12v. Electric potential can drive a current only if there is a loop.
im trying to apply this to finding the maximum potential difference in a series of capacitors from point a to point b. the way i solved it didn’t give me the right answer and i don’t think i really understand it
Voltage is caused by the presence of protons and electrons, if you take protons only as the indicator of voltage, then the ratio of protons to electrons at a certain point is directly proportional to the voltage, but if you have no protons at all at this certain point, and only electrons, voltage is negative. And vice versa.
Your definition of potential difference or voltage is rather vague not explaining what voltage or potential difference is actually is , merely give some mathematical quantities with the unexplained term The phrase "potential difference " is ambiguous , not clearly indicate what really is potential here I bet that all you guys will say that it is electric potential energy . Even so it is still ambiguous , because there are different types electrical potential energy involved in such a circuit, such as mechanical energy, thermal energy and chemical energ. The correct term for the phenomenon is ekectromotive force , but not energy Lets see why it is so If you want to use mathematics to explain it, here is an appropriate way to do so F=Fd where F is electric force , d is displacement , w is the work to be done by the force to move a charge carrier from one point to another point in an applied electric field F = qE ---> w = qEd Since w = - (Uf-Ui) = Ui-Uf , qEd = Ui -Uf Where Uf = final ekectric potential energy , Ui = initial electric potential energy Since Uf -Ui = q (Vf-Vi) ---> -( Uf -Ui) = -q (Vf-Vi) --> Ui -Uf = q (Vi-Vf)---> qEd = q (Vi-Vf) where q = total charge, Vi = initial electromotive force , Vf = final electromotive force Rearranging the Eq " qEd ="q (Vi-Vf) to represent the electromotive force gives: qE = F = q ( Vi - Vf)/ d Since q is conserved, you should not ignorantly apply any mathematical manipulation to remove q from the equation Now you can see so obviously that the only changes here are a change of displacement or distance and a change of the value of the electric field, and when the value of distance increases , the strength of electric field will decrease , and thus the strength of the electromotive force on a charger carrier, such as an electron will also decrease. The force here is composed of an attractive force and a repulsive force from the positive terminal and the negative terminal of a power source Soppose that there are 2 points, point B is closer to the positive terminal, and point A is closer to the negative terminal of a DC circuit, and an electron is moving from the negative terminal toward the positive terminal of the power source due to the repulsive force from accumulated electrons at the negative terminal The attractive force from the positive terminal on the electron at point B is stronger than that on it at point A, because the distance between the positive terminal and point B is shorter than that between the positive terminal and point A , and similarly the repulsive force from the negative terminal on it is stronger at point A than that on it at point B , because point A is closer to the negative terminal than point B is It means that if the positive terminal is considered to be the reference point to evaluate the attractive force on it, using the transmission of positive charge from the positive terminal , and from ionized atom to ionized atom to the negative terminal in which each atom in the lattice structures of the conducting materials of the circuit respectively becomes an ion when the repulsive force from the negative terminal is transmitted from free electron to free electron throughout the circuit, and respectively repels the atoms' free electron(s) in their valances, then the electromotive force from the positive terminal on ions decreases as the transmission of the positive charge moves from point B to point A. In other words, Vf at point A is smaller than Vi at point B, and that is why you have a weaker electric force on the transmitted positive charge at point A , and a stronger electric force on it at point B You can say voltage Vi at point B is higher than voltage Vf at point A if that ambiguous definition makes it easier for you to understand how electricity is actually established in a DC circuit. But it is not so simple as the idea that electricity is a flow of electrons from the negative terminal to postive terminal, or a flow of current "i" from the positive terminal to the negative terminal as thecway how all of you guys always fundamentally misunderstand it The so-called" the conventional direction of current" is a statement of ignorance, because it is not at all any sort of symbolic representation of current direction. Oppositely the transmitted positive charge from ionized atom to ionized atom from one end of an electrical circuit connected to the positive terminal of a power source to its other end connected to the negative terminal of the power source is an indispensable part of the formation of electricity. Without the function of such ionized atoms as positively charged place-holders to attract free moving electrons which are repelled away by accumulated electrons at the negative terminal from the atoms of the conducting circuit , immediately next to the negative terminal, there would be not any flow of negative charge carriers or electrons from the negative terminal to the positive terminal at all. Ionized atoms are the 2nd medium which takes part in transmitting electromotive forces which give free electrons kinetic energy to move through a resistive load , and collide with free electrons in the circuit , and their collisions cause frictional forces which convert the kinetic energy into thermal energy for light bulbs, heating machines such as stoves, elecctric cookers, and into mechanical forces to run other types of machine to do work for human purposes Both the positive charge transmitted from the positive terminal, and from ionized atom to ionized atom throughout the circuit to the negative terminal, and the flow of electrons from the negative terminal to the positive terminal equally play an important role in the establishment of electricity in any DC circuit Voltage actually is a separation of two opposite charges to create an electromotive force which can move charge carriers in a circuit That is why what you guys always call ambiguously as voltage or potential difference is actually electromotive force formed by the combination of an attractive force and a repulsive force
