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Physics Honors/AP 1 and 2

Chapter 21: 6-15 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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Physics 21: 6-15 Applications of Induction and LRC Circuits


Reading Preparation

Text Reading: Giancoli, Physics - Principles with Applications, Chapter 21: 6-15

Study Points

Key Equations

  • The Generator Equation: ℰ  = Bl v   =   2   NBlv   sin   θ   =   NB ω A   sin   ω t
  • Transformer Voltages: V S   =   N S   Δ Φ B Δ t V P   =   N P   Δ Φ B Δ t
  • Inductance (emf in coil #2 from changing current in coil #1) 2   = M Δ I 1 Δ t
  • Energy stored in a magnetic field: U   =   ½ L I 2   = ½ B 2   μ 0 Al   where   energy   density   u   =   ½ B 2   μ 0
  • LR Circuit current I   =   V 0 R ( 1     e t τ )   where   τ   =   L R
  • Inductive reactance X L   =   ω L   =   2 π fL
  • Capacitive reactance X C   =   1 ω C   = 1   2 π fC
  • Average power in LRC circuit: P   =   I rms 2   Z   cos   φ
  • Resonance in AC circuits f 0   =   1 2 π 1 LC

Web Lecture

Read the following weblecture before chat: Generators and Transformers

Study Activity

Use the electric motor simulator ==>HERE<== to explore how electrical current can be transformed to mechanical rotational motion.

  • Draw a diagram of the circuit (you may have to scroll to see all of it).
  • Complete the connections to the motor.
  • Switch on the curcuit and increase the voltage. How does voltage and current change through the resistor?
  • As the motor rotates, what happens to the direction of the magnetic field? What happens to the direction of the current?
  • What happens if you revers the connections to the motor?
  • How are the directions of magnetic force (Laplace force), current, and magnetic field related?

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!