# P219lecture12AC - Goal To understand AC circuits and how...

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Goal: To understand AC circuits and how they apply to resistors, capacitors, and inductions Objectives: 1) To learn about alternating current 2) To explore how voltages and currents of simple AC circuits compare to DC circuits 3) To understand Capacitors in an AC circuit 4) To understand Inductors in an AC circuit

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What is alternating current? So far we have looked at what is called “direct current”. That is you have a constant current with time. However long ago it was discovered that it was far more efficient and useful to use a current that varied with time. Alternating current fluxuates over some time period from 0A to its maximum. For the home the time span of the fluxuation is 1/60 th of a second (a frequency of 60 Hz).
Voltage with time The voltage is a sine wave. V(t) = Vmax * sin(wt) where w is the angular frequency Actual physical frequency is f = w/2π And period = 1/f

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Root Mean Square The average voltage or power is found by the Root Mean Square.
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• Spring '10

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