PHYS 2002 Lecture : Lecture8
Document Summary
Resistance: how hard it is to pass current through a material. Takes more voltage to get a certain amount of current through. 20. 5 alternating current: direct current (dc) circuit: current goes in one direction. Current flows from high potential to low potential. Like in a circuit with a battery: alternating current (ac)circuit: current direction alternates. The voltage difference between the prongs oscillates with time: the symbol for an ac power source in a circuit diagram is the following: Since the current periodically changes direction, the voltage changes in time and goes from + to - : At certain times, the left prong has higher potential. At certain times, the right prong has higher potential. 20. 5 alternating current: ac circuit voltage: sine function of time. Vo =peak (maximum) voltage f = oscillation frequency (in hertz . Hz: note: the angle 2 f = t must be in radians.
