Columbia Encyclopedia

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current, electric

(Encyclopedia)current, electric, net movement or flow of electric charge from one point to another or across some boundary. See alternating current; direct current; electricity. ...

Copper Age

(Encyclopedia)Copper Age: see Bronze Age.

circuit, electric

(Encyclopedia)circuit, electric: see electric circuit. ...

potential, electric

(Encyclopedia)potential, electric, work per unit of electric charge expended in moving a charged body from a reference point to any given point in an electric field (see electrostatics). The potential at the refere...

power, electric

(Encyclopedia)power, electric, energy dissipated in an electrical or electronic circuit or device per unit of time. The electrical energy supplied by a current to an appliance enables it to do work or provide some ...

New Age

(Encyclopedia)New Age, a term popularized in the 1980s to describe a wide-ranging set of beliefs and practices that are an outgrowth of the counterculture of the 1960s and 70s in the United States. Adherents of the...

old age

(Encyclopedia)old age: see geriatrics.

Stone Age

(Encyclopedia)Stone Age: see Paleolithic period; Mesolithic period; Neolithic period. ...

battery, electric

(Encyclopedia)CE5 Lead storage cell: At the lead-dioxide electrode, electrons from the circuit combine with lead dioxide and sulfuric acid to form lead sulfate and water. At the spongy-lead electrode, lead react...

Bronze Age

(Encyclopedia)Bronze Age, period in the development of technology when metals were first used regularly in the manufacture of tools and weapons. Pure copper and bronze, an alloy of copper and tin, were used indiscr...