Applicable for A-Level, IB, DSE, AP-Level Exams
Electric field strength is defined as the force per unit charge on a positive test charge placed at that point.
The electric potential is the work done per unit positive charge on a positive test charge when it is moved from infinity to that position. When moving in an equipotential, no work is done. Electric potential energy can be found by the area under the graph of E against r.
Gravitational and electric fields are similar and can be compared together. Diagram credited from ScienceShorts YouTube channel.