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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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What does the future hold for us

  • 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
lets talk averages

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

ZERO!


Look at the square what is its average
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??)







The math
The Math …..

}

Average = ZERO




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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