E - volt.

EMF - electromotive force, which is another term for voltage.

Electricity - The flow of electrons through conductive materials and devices.

Electrode - A conductor used to establish electrical contact with a nonmetallic part of a circuit.

Electrolyte - The dilute solution of approximately 25% sulfuric acid (H2SO4) and 75% water by volume in a lead-acid battery, it conducts electricity required for the battery to supply energy. A lead-acid battery may have a liquid, gelled or immobilized electrolyte.

Electrolysis - The chemical process that breaks down the water in the electrolyte, releasing hydrogen from the cathode and oxygen from the anode.

Electromechanical - Of, relating to, or being a process or device that converts electrical energy into mechanical movement. A starter motor and an alternator are electromechanical devices.

Electromotive Force (EMF) - voltage.

Electron - A negatively charged particle that orbits the nucleus of an atom.

Element - In a battery, a set of positive (+) plates and negative (-) plates along with separators.

Energy Density - The ratio of a battery's energy-delivery capability to its weight or volume, measured in watt-hours per kilogram or watt-hours per cubic centimeter.

Equalizing Charge - A charging method that equalizes the specific gravity or voltage levels of individual cells in a battery or a group of batteries connected in series.