- Eclipse
- (n.) A temporary phenomenon during which one celestial body obscures another. An eclipse can be total or partial depending on whether the eclipsed body disappears completely or partially. Total solar eclipses are only visible in a relatively narrow shadow band about 200 km wide; their maximum duration is 8 minutes at the equator and 6 minutes at mid-latitudes.
- Ecliptic
- (n.) The plane in which the Earth moves around the Sun.
- Effective Intensity
- (noun) In the case of a variable current, the intensity equal to the continuous intensity producing the same average effects. It is measured with an ammeter in alternating current mode.
- Electric Current
- (n.) Movement of electrically charged particles (electrons, positive or negative ions).
- Electric Voltage
- (n.) Difference in electrical potential between two points in an electrical circuit. It is measured with a voltmeter and expressed in volts (V).
- Electrical Conductor
- (n. or adj.) Allows the passage of current by presenting relatively low electrical resistance.
- Electrical Energy
- (n.) Energy produced by electrical generators.
- Electrically Neutral
- (adv.) Not electrically charged. Its electrical charge is zero.
- Electrification
- (n.) The process of being electrified, meaning traversed by an electric current.
- Electrochemical Cell
- Device that contains chemical energy which can be transformed into electrical energy when it produces an electric current and is the site of a chemical transformation.
- Electrocution
- (n.) Death resulting from the passage of an electric current through the human body.
- Electron
- (n.) (from the Greek êlektron, meaning yellow amber) A particle charged with negative electricity and a constituent of atoms. The charge of the electron is -1.60×10-19 coulombs, denoted as –e.
- Eluant
- (n.) A liquid used in chromatography. It carries the constituents of a homogeneous mixture at different speeds.
- Energy Transfer
- (n.) Passage of energy from one object to another.
- Energy
- (n.) A quantity indicating the capacity of an object to produce actions or effects. Energy is neither created nor destroyed but transforms from one form to another. Its legal unit is the joule (J).
- Evaporation
- (n.) The transition from the liquid state to the gaseous state at the free surface. This phenomenon is used in salt marshes. Seawater evaporates naturally, leaving its salt on the ground, which can be collected.
- Expandable
- (adj.) Having a volume that increases by simple stretching. The expansion of a gas is accompanied by a decrease in its pressure and temperature. It is by using this property that refrigerator cooling systems operate.
- Eye
- (n.) Sensory organ that enables vision.