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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?


Ac part 3

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


Ac part 3

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



Ac part 3


Ac part 3

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