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Physics 6 Online
OpenStudy (greatlife44):

Help

OpenStudy (greatlife44):

@Michele_Laino

OpenStudy (greatlife44):

Was wondering if someone could explain current, voltage, and resistance?

OpenStudy (greatlife44):

anyone ?

OpenStudy (priyar):

(I)Current is a flow of electrical charge carriers, usually electrons.. (V)Voltage refers to the potential difference. (R)The "electrical resistance" of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor. They are related by : V=IR (this is from OHM's LAW as you might know..) Did you understand @greatlife44 ?

OpenStudy (michele_laino):

let's consider a conductor, namely a parallelepiped of gold, silver or mercury Inside that conductor there are many free electrons which can move freely inside the conductor Now, if I apply an external voltage, then such free electrons will move from the negative electrode to the positive electrode: |dw:1457208614220:dw|

OpenStudy (michele_laino):

|dw:1457208846897:dw| since the electrons will move towards the positive electrode, then the have gained kinetic energy, and this kinetic energy comes from their potential energy at the start of their motion, namely when such electrons were close to the negative electrode So, such \(potential\; energy \) is the \(applied\; voltage\), the \(flow\) of such electrons is the \(current\) and the ratio: \(voltage/current\) is the \(electical\; resistance\) of the parallelepiped of gold

OpenStudy (michele_laino):

oops.. electrical* resistance...

OpenStudy (michele_laino):

|dw:1457209163684:dw|

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