Inductance. Chapter 30. PowerPoint Lectures for University Physics, Thirteenth Edition Hugh D. Young and Roger A. Freedman. Lectures by Wayne Anderson
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1 Chapter 30 Inductance PowerPoint Lectures for University Physics, Thirteenth Edition Hugh D. Young and Roger A. Freedman Lectures by Wayne Anderson
2 Goals for Chapter 30 To learn how current in one coil can induce an emf in another unconnected coil To relate the induced emf to the rate of change of the current To calculate the energy in a magnetic field To analyze circuits containing resistors and inductors To describe electrical oscillations in circuits and why the oscillations decay
3 Introduction How does a coil induce a current in a neighboring coil. A sensor triggers the traffic light to change when a car arrives at an intersection. How does it do this? Why does a coil of metal behave very differently from a straight wire of the same metal? We ll learn how circuits can be coupled without being connected together.
4 Mutual inductance Mutual inductance: A changing current in one coil induces a current in a neighboring coil. See Figure 30.1 at the right. Follow the discussion of mutual inductance in the text.
5 Mutual inductance examples Follow Example 30.1, which shows how to calculate mutual inductance. See Figure 30.3 below. Follow Example 30.2, which looks at the induced emf.
6 Self-inductance Self-inductance: A varying current in a circuit induces an emf in that same circuit. See Figure 30.4 below. Follow the text discussion of self-inductance and inductors.
7 Potential across an inductor The potential across an inductor depends on the rate of change of the current through it. Figure 30.6 at the right compares the behavior of the potential across a resistor and an inductor. The self-induced emf does not oppose current, but opposes a change in the current.
8 Calculating self-inductance and self-induced emf Follow Example 30.3 using Figure 30.8 below. Follow Example 30.4.
9 Magnetic field energy The energy stored in an inductor is U = 1/2 LI 2. See Figure 30.9 below. The energy density in a magnetic field is u = B 2 /2µ 0 (in vacuum) and u = B 2 /2µ (in a material). Follow Example 30.5.
10 The R-L circuit An R-L circuit contains a resistor and inductor and possibly an emf source. Figure at the right shows a typical R-L circuit. Follow Problem-Solving Strategy 30.1.
11 Current growth in an R-L circuit Follow the text analysis of current growth in an R-L circuit. The time constant for an R-L circuit is τ = L/R. Figure at the right shows a graph of the current as a function of time in an R-L circuit containing an emf source. Follow Example 30.6.
12 Current decay in an R-L circuit Read the text discussion of current decay in an R-L circuit. Figure at the right shows a graph of the current versus time. Follow Example 30.7.
13 The L-C circuit An L-C circuit contains an inductor and a capacitor and is an oscillating circuit. See Figure below.
14 Electrical oscillations in an L-C circuit Follow the text analysis of electrical oscillations and energy in an L-C circuit using Figure at the right.
15 Electrical and mechanical oscillations Table 30.1 summarizes the analogies between SHM and L-C circuit oscillations. Follow Example Follow Example 30.9.
16 The L-R-C series circuit Follow the text analysis of an L-R-C circuit. An L-R-C circuit exhibits damped harmonic motion if the resistance is not too large. (See graphs in Figure at the right.) Follow Example
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