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# AC – Part 3 - PowerPoint PPT Presentation

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

• 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

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

ZERO!

Look at the square; what is its average?

ALWAYS POSITIVE

120V is the ‘rms’ value. (Did you know that??)

Energy !

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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