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I Really confused about voltage and some other quetions

  1. Oct 17, 2016 #1
    Please explain how or why (I have zero knowledge in physics)..

    1. is Voltage the energy required by the elctrostatic forces between 2 points to move a certain quantity of charge between them?

    2. Why is it called potential difference? Does this have to do with the difference in potential energy between two regions of opposite net charges? Why? In mechanics as I learned potential energy is the energy an object has due to its shape or position (change in PE= Change in H * G*M), what does this mean in a circuit?

    3. Current, when the current is of a higher magnitude, do the electrons flow faster within a certain imaginary plane at a given time or just that there are are more electrons? does the speed of current vary in a circuits?

    4. If resistance in a circuit is zero, does this mean there can not be any voltage? V = I * R and the multiplicative property of 0. Or is it not possible to not have 0 resistance?

    5. What is meant by thsi statement "IN engineering the current direction describes the net positive flow"?

    6. Is thE " WORK DONE" to move one charge to another region of net opposite charge given by multiplying the ([Q1*Q2/R^2]*k)* distance between the charges? what does this have to do with voltage?
     
  2. jcsd
  3. Oct 17, 2016 #2
    7. Why is the source of voltage always having a voltage of 0, is this because it is the "lowest" point much like an object on a ground has 0 potential energy? because distance between charges is very little at the source, but they have to travel through a wire or other medium, so why is voltage 0 for the source and this is the standard for comparision for other elements.
     
  4. Oct 17, 2016 #3
    9. If electrons dont have the speed everywhere in the circuit, doesen't it mean their KINETIC ENERGY is changing and the work done by electrostatic forces increases? this would increase the voltage, yes?

    "A difference in electrical charge between two regions and a medium between them to allow flow of electrons is enough to establish a current, a creation of voltage leads to a flow of current" is a correct statement?
     
    Last edited: Oct 17, 2016
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