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Physics Honors/AP 1 and 2

Chapter 18: 7-10 Assignment

Course Materials are always under revision! Weblecture content may change anytime prior to two weeks before scheduled chat session for content.

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Homework

Physics 18: 7-10 Alternating Current

Homework

Reading Preparation

Text Reading: Giancoli, Physics - Principles with Applications, Chapter 18: Sections 7 to 10

Study Points

Key Equations

  • Alternating current voltage, current, and power: V   =   V 0 sin   2 π ft   =   V 0 sin   ω t    I   =    I 0 sin   ω t    P   =   I 0 2 R   sin   2 ω t   
  • Average values (root mean square values): If   x   =    sin   2 ω t ,   x avg   =   ½ .

    P   =   I 0 2 R   sin   2 ω t    P avg   = ½ I 0 2 R  

    x rms   =   ( x avg ) 2 P   =   I rms V rms   =   ½ I 0 2 R   =   I rms 2 R    =   ½ V 0 2 R    =   V rms 2 R  

Web Lecture

Read the following weblecture before chat: Alternating Current and Electrical Power

Study Activity

Use a graphic calculator, a tool such as Mac's Grapher, such as the one at Desmos.

  • Enter an equation in the form y = sin 2πt and graph it. This is essentially the same as V = V0 sine 2πf0t, when V0 = 1 and f0 = 1.
  • Now vary the equation by adding a different period, instead of 2 πt, enter 2 π2t. What happens?
  • Now vary the equation by adding a different period, instead of 2 πt, enter 2 π(1/2)t. What happens?
  • Now vary the equation by adding a different maximum value for V0, such as 2 or 3. What happens?
  • How does changing the maximum voltage on an AC circuit change the behavior of current on the circuit?
  • How does changing the oscillation period on the AC circuit change the behavior of the circuit?

Chat Preparation Activities

Chapter Quiz

Lab Work

If you want lab credit for this course, you must complete at least 12 labs (honors course) or 18 labs (AP students). One or more lab exercises are posted for each chapter as part of the homework assignment. We will be reviewing lab work at regular intervals, so do not get behind!