Current, Resistivity, Semiconductors
Current The movement of charge Symbol is I, unit is A amp I=q/t Amp= coulomb/sec Conventional Current from positive to negative
Battery Batteries produce direct current The difference in electrical potential energy is called electromotive force emf Work done by a battery= amount of charge X emf of battery W=∆Qε
Resistance Collisions between electrons and atoms in a wire cause resistance creating an opposition to the flow of charge Symbol is R, unit is Ohms Ω R= V/I
Ohm’s Law V= I/R V I R
Resistance Wire’s resistance is affect by 1. Type of material 2. Length 3. Temperature R=ρ(L/A)
Semiconductors Go to page 754-756 Outline the types of semiconductors and their behaviors, Define diodes and explain how they work, Describe how transistors work and why they are important Work Lesson Check p 757 6-8,12-14