This segment is on Electric field moving on to Voltage and Current and their inter-dependency. This may go slightly ugly so am keeping all my base thought through Newtonian mechanics and I am not going into quantum theory.
Electric field is defined as the electric force per unit charge. The direction of the field is taken to be the direction of the force it would exert on a positive test charge. The electric field is radially outward from a positive charge and radially in toward a negative point charge.Do you know why? That’s where potential and Energy Comes in!!!!
Apart from these there are a few more definitions to Electric Field. We know that force is always a vector resultant. Electric field is force per charge, Which gives that Electric field is also a vector resultant. (yes, We need those wherever direction is important.)
So there comes a question! How do we study them ???
Here’s the answer: Electric Field Lines!!
I want to make it simple so am putting it short and sweet!
Lines begin and end only at charges (beginning at + charges, ending at – charges) or at Infinity.
Lines are closer together where the field is stronger.
Larger charges have more field lines beginning or ending on them.
Electric Field lines never cross (since E must point in a definite direction unless it is zero).
At any location, the direction of the electric field is tangent to the electric field line that passes through that location.
I have put up a video from youtube to make things easier if you have trouble.