1. Define potential difference. What is the difference between electric potentia

Question

1. Define potential difference. What is the difference between electric potential and electric potential energy? What is the unit for potential difference?
2. What two units are used for electric fields? Write out the units of both to show that they are equivalent.
3. Why are the electric field lines always perpendicular to equipotential lines?
4. Why can electric field lines never cross?
5. The LED will only light up if enough electrical current is flowing through it. The amount of current is given by I = V/R, where V is the potential difference. Why does it only light up when it is pointing in the same direction as the electric field?

Please show me step by step. Thank you so much for your help

Explanation / Answer

potential difference is defined as the amount of energy needed per unit charge to move a charge from one reference to another reference point in the static electirc field. electric potential is nothing but voltage electric potential energy is nothing but work done unit of potential difference Volt (2) N/ C   (or)   V/ m    E = F /q   (o) E = V/r (3) the work done to move a charge on the equipotential surface is always zero If the field is not doing any work on the particle as it moves, then the direction of the field's force must be perpendicular to the direction of the particle's motion; i.e., perpendicular to the equipotential line (4) if the electric field lines are crosed with each other , at that point electric field has two direction but it is not possilble. hence electric field lines never cross

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