Einstein mass energy relation:  E = mc2, E is the energy released, m is the mass defect and c is the speed of light. 
Electric current:  The rate of flow of electric charge. 
Electric field line:  An imaginary curve tangent to which at a point gives the direction of electric field at that point. 
Electric potential energy:  The energy due to the position of a charge near other charges. 
Electrical conductors:  The materials that have free electrons and allow current to flow through them. 
Electrical insulators:  The materials which do not allow current to flow through them. 
Electrical resistance:  The property to oppose the flow of current. 
Electromagnetic induction:  The process in which current is induced in a coil whenever there is a change in the magnetic flux linked with the coil. 
Electron volt:  The energy gained by an electron when it passes through a potential difference of one volt, it is equal to 1.60 x 1019 Joules. 
Endothermic process:  The process in which heat is absorbed. 
Exothermic process:  The process in which heat is evolved. 
Escape Velocity:  The minimum velocity with which an object must be thrown upwards so as to overcome the gravitational pull, it is equal to , where M is the mass of the planet and R is the radius of the planet. 
