Physics 102: Lecture 5, Slide 3Electric Terminology• Current: Moving Charges – Symbol: I– Unit: Amp≡Coulomb/second– Count number of charges which pass point/sec– Direction of current is direction that + flows•Power: Energy/Time– Symbol: P– Unit: Watt≡Joule/second = Volt Coulomb/sec– P = VI
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Physics 102: Lecture 5, Slide 4Physical Resistor•Resistance: Traveling through a resistor, electrons bump into things which slows them down. R = ρL /A –ρ: Resistivity: Density of bumps–L: Length of resistor–A: Cross sectional area of resistor•Ohms Law I = V/R–Cause and effect (sort of like a=F/m)•potential difference cause current to flow•resistance regulate the amount of flow–Double potential difference ⇒double current–I = (VA)/ (ρL)AL