April 24th, 2006 AC Circuits PHYS 102

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Presentation transcript:

April 24th, 2006 AC Circuits PHYS 102 Alternating Current (AC) circuits. So far we have been talking about Direct Current.

PHYS 102 angular frequency phase amplitude April 24th, 2006 AC Circuits PHYS 102 Time varying currents can be produced by time varying voltages. (Like that supplied by the wall socket) Recall: need to identify amplitude, frequency, and phase constant for sinusoidal functions. New symbol: AC voltage source. amplitude phase angular frequency

We restrict our discussion to sinusoidally varying currents. April 24th, 2006 AC Circuits PHYS 102 We restrict our discussion to sinusoidally varying currents. amplitude angular frequency phase

Does it make sense to talk about averages? April 24th, 2006 AC Circuits PHYS 102 Does it make sense to talk about averages? To discuss averages for sinusoidal functions, one would obtain a value of zero! Yet, the wall socket value of 120V is a type of average.

PHYS 102 Does it make sense to talk about averages? April 24th, 2006 AC Circuits PHYS 102 Does it make sense to talk about averages? Answer: YES! (But we need to discuss a root mean square average).

April 24th, 2006 AC Circuits PHYS 102 Root mean square (RMS):

PHYS 102 Where AC Circuits T is the period of oscillation. April 24th, 2006 AC Circuits PHYS 102 Where T is the period of oscillation.