All other charges are multiples of this basic unit of charge. The force between electric charges has a very similar form to that of gravitational force. This is similar to the gravitational potential, except it is for electrical charges.
Electric field is a vector, i.e. it has both magnitude and direction.
The unit is volt . One volt is one joule per coulomb. A conductor allows electrons to pass with little loss of energy. Examples are metals, such as copper. An insulator does not allow electron to pass through.