| 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 10-19 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. |
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