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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. 1 2 3 4 5 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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