 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.

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Presentation transcript:

 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.

An AC source with Δ V max = 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

What is the time average of this sine (AC) signal?

ALWAYS POSITIVE

What is the AMPLITUDE of the voltage that comes into your home?? 120V is the ‘rms’ value. (Did you know that??)

} Average = ZERO

The power of a certain CD player operating at 120 V rms is 20.0W. Assuming that the CD player behaves like a pure resistance, find (a)the maximum instantaneous power. (b)the rms current. (c)the resistance of this player.

A series R-L-C circuit is connected to a 120 Hz ac source that has Vrms = 80.0 V. The circuit has a resistance of 80.0  and an impedance of 106  at this frequency. What average power is delivered to the circuit by the source? 106  80.0  