1. electric charges
   1. positive and negtive
   2. repel and attract
   3. rubber rode - glass +
   4. conservation in system
   5. q=Ne
2. conductor
   1. have free e
   2. semiconductor & insulator
3. Coulomb's law
   1. F=kQq/R^2
   2. vector nature
4. superposition-F of one charge=sum of all F
5. electric field
   1. region around charged object
   2. source & test charge
   3. E=F/q
   4. electric field lines