Lecture%2029%202220%20Spring%202009

Lecture%2029%202220%20Spring%202009 - Reminders and...

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1 Reminders and Announcements • HW 17 is due Tuesday; HW 18 is due Friday • Help Room Hours (Physics 117) Help Room Hours (Physics 117): – M 4-8 pm, T 3-6:30, W 3-6:30, R 4:30-8, F 2-6 1. 2. 3. 12345 0% 0% 0% 0% 0% 4. 5. 0 of 5 Summary of Circuit Elements, Impedance and Phase Angles Power in an AC Circuit • The average power delivered by the generator is converted to internal energy in the resistor P av = ½ I max Δ V max cos φ = I rms Δ V rms cos φ cos φ is called the power factor of the circuit • We can also find the average power in terms of R P av = I 2 rms R Power in an AC Circuit, cont. • The average power delivered by the source is converted to internal energy in the resistor No power losses are associated with pure • No power losses are associated with pure capacitors and pure inductors in an AC circuit Power and Phase • The power delivered by an AC circuit depends on the phase • Some applications include using capacitors Some applications include using capacitors to shift the phase in heavy motors so that excessively high voltages are not needed
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This document was uploaded on 09/30/2009.

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Lecture%2029%202220%20Spring%202009 - Reminders and...

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