ECE General Knowledge
DEFINITIONS:
1. Electrical Charge : – a property of subatomic particles that determines a particle’s electromagnetic interaction; measured in SI units Coulombs (C)
Elementary charge e = 1.602*10-19 C
Charge of electron –e = -1.602*10-19 C
Charge of proton e = +1.602*10-19 C
2. Current :– rate of flow of charges through a fictitious boundary
3. Voltage : – difference in electrical potential; measured in volts
Basic Passive Electrical Properties and Components:
1. Resistance: – a measure of an object’s opposition to the passage of electrical current; measured in SI unit ohm (Ω)
Resistor: – a two-terminal electrical component that resist the flow of charge
Symbol: 
2. Capacitance: – a measure of an object’s ability to hold charge
Capacitor:— an electrical component consisting of a pair of conductors separated by a dielectric; measured in SI unit farad (F)
Symbol: 
3. Inductance:— a property of an electrical component through which a current induces an electromotive force (EMF) opposing the change in current
Inductor— an electrical component that establishes inductance; measured in SI unit henry (H)
Symbol: 
References:
1. Qi, Minghao (2007, Fall) ECE 201 Notes
Retrieved March 18,2010 from http://cobweb.ecn.purdue.edu/~ece201/handouts/Lecture_notes_Qi/Index.html
2. Inductance. (n.d.) In Wikipedia. Retrieved March 18, 2010 from http://en.wikipedia.org/wiki/Inductance
