Announcements

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Be sure to fill out the online course evaluationsHW 12 is now due FRIDAY DEC 9th, 8AM

HW 13 is now due TUESDAY DEC 12th, 8AM

Today, we will cover the rest of the lecture for Week 12 AND the entire lecture for Week 13.

Recitations next week will cover problems from HW 12 and HW 13

Lecture next week will cover (a) problems from HW 13 (if any are left). We will also begin reviewing for the final exam.

Recitation on Monday Dec 12th will also be a review for final

ICLICKER QUESTION #0

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A) 8:30-11AM

B) 11:30-2pm

C) 2:30-5pm

D) None of these times are good, I would prefer a different day.

Option Review for the Final exam will be on MONDAY Dec 19th at the following time:

Show Active Figure 33.3 of Phasor

Clicker Question #1

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Consider the voltage phasor in Figure 33.4, shown at three instants of time. Choose the part of the figure

that represents the instant of time at which the instantaneous value of the voltage has the largest

magnitude.

1. (a)2. (b)3. (c)

Figure 33.4

RMS current

Current LAGS Voltage in Inductor

Show Active Figure 33.6

Clicker Question #2

Consider the AC circuit in Figure 33.8. The frequency of the AC source is adjusted while its voltage amplitude is held constant. When does the light bulb glow the brightest?

1. It glows brightest at high frequencies.

2. It glows brightest at low frequencies.

3. The brightness is the same at all frequencies.

Figure 33.8

Current LEADS voltage in a Capacitor

Show Active Figure 33.10

Clicker Question #3

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Consider the AC circuit in Figure 33.12. The frequency of the AC source is adjusted while its voltage amplitude is held constant. When does the light bulb glow the brightest?

1. It glows brightest at high frequencies.

2. It glows brightest at low frequencies.

3. The brightness is the same at all frequencies.

Figure 33.12

RLC Series Circuit

Phase Relation of various voltages

Clicker Question #4

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Label each part of Figure 33.16, (a), (b), and (c), as representing XL > XC, XL = XC, or XL < XC. Describe figure (a).

1. XL > XC

2. XL = XC

3. XL < XC

Figure 33.16

HINT:

What is the impedance of a series RLC circuit at resonance?

1. larger than R 2. less than R 3. equal to R 4. impossible to

determine

2 2( )L cZ R

Clicker Question #5

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Transformer can “step up” or “step down” the voltage.