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2013 unit 2 as elect

Category: Definition

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Created by: Susan E Casey

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

transfer	energy _____ /work done per unit time	2	1	true
electrons	are + ions or electrons in an electrolyte, _____ in a conductor	3	1	true
Current	Definition: the charge supplied by a current of 1 amp in 1 second	4	0	false
Electromotive force	Definition: the electrical energy transferred per unit charge from other forms of energy	5	0	false
electron	the average velocity of an _____ when it travels through a wire due to an applied pd	6	1	true
Terminal p.d.	Definition: the potential difference available from the output terminals of a source of electricalenergy when current flows	7	0	false
conservation	Kirchoffs first law (due to _____ of charge)	8	0	true
section	resistivity=resistance x cross _____ area/length	11	1	true
charge	the _____ supplied by a current of 1 amp in 1 second	12	1	true
Volt	Definition: joule per coulomb (JC-1)	13	0	false
p.d./current	Term: Resistance	14	1	false
proportional	current through a conductor is _____ to the potential difference across it provided temperature remains constant	15	1	true
Kilowatt hour	Definition: a unit of energy equal to 1 kw for 1 hour (or 3.6 Mj)	16	0	false