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# 2013 unit 2 as elect

TermDefinition
charge carriers are + ions or electrons in an electrolyte, electrons in a conductor
Coulomb the charge supplied by a current of 1 amp in 1 second
Current the charge supplied by a current of 1 amp in 1 second
Drift velocity the average velocity of an electron when it travels through a wire due to an applied pd
Electromotive force the electrical energy transferred per unit charge from other forms of energy
Kilowatt hour a unit of energy equal to 1 kw for 1 hour (or 3.6 Mj)
Kirchoffs first law (due to conservation of charge) the total current flowing into a junction is the same as the total out.
Kirchoffs second law (due to conservation of energy) sum of the e.m.f.s around a closed loop = sum of the p.d.s
Ohm a volt per amp ( VA-1)
Ohm's Law current through a conductor is proportional to the potential difference across it provided temperature remains constant
Potential difference energy transfer per unit charge from electrical to other forms
Power energy transfer /work done per unit time
Resistance p.d./current
Resistivity resistivity=resistance x cross section area/length
Terminal p.d. the potential difference available from the output terminals of a source of electricalenergy when current flows
Volt joule per coulomb (JC-1)
Created by: Susan E Casey