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AC – Part 3. Today – Continue with AC Problems Some new material from the chapter Quiz on Friday; Exams will be returned and reviewed. There is a new Mastering Physics Assignment that finishes the chapter. Continue with chapter. Monday – Electromagnetic Waves – Putting it all together.

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## AC – Part 3

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**Today – Continue with AC**• Problems • Some new material from the chapter • Quiz on Friday; Exams will be returned and reviewed. • There is a new Mastering Physics Assignment that finishes the chapter. • Continue with chapter. • Monday – Electromagnetic Waves – Putting it all together. what does the future hold for us?**An AC source with ΔVmax = 125 V and f = 25.0 Hz is**connected between points a and d in the figure. Calculate the maximum voltages between the following points: (a) a and b 62.8 V(b) b and c 45.6 V(c) c and d 154 V(d) b and d 108 V**lets talk averages**What is the time average of this sine (AC) signal? ZERO!**Look at the square; what is its average?**ALWAYS POSITIVE**What is the AMPLITUDE of the voltage that**comes into your home?? 120V is the ‘rms’ value. (Did you know that??)**what do we pay for?**Energy !**The Math …..**} Average = ZERO**The power of a certain CD player operating at 120 Vrms is**20.0W. Assuming that the CD player behaves like a pure resistance, find • the maximum instantaneous power. • the rms current. • the resistance of this player.**A series R-L-C circuit is connected to a 120 Hzac source**that has Vrms = 80.0 V. The circuit has a resistance of 80.0 Wand an impedance of 106 Wat this frequency. What average power is delivered to the circuit by the source? 106W 80.0 W f

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