Figure 24.1 Human eyes detect these orange “sea goldie” fish swimming over a coral reef in the blue waters of the Gulf of Eilat (Red Sea) using visible light. (credit: Daviddarom, Wikimedia Commons) Chapter Outline 24.1 Maxwell’s Equations: Electromagnetic Waves Predicted and Observed…
23.1 Induced Emf and Magnetic Flux 23.2 Faraday’s Law of Induction: Lenz’s Law 23.3 Motional Emf 23.4 Eddy Currents and Magnetic Damping 23.5 Electric Generators 23.6 Back Emf 23.7 Transformers 23.8 Electrical Safety: Systems and Devices 23.9 Inductance 23.10 RL Circuits 23.11 Reactance, Inductive and Capacitive 23.12 RLC Series AC Circuits
Learning Objectives By the end of this section, you will be able to: Impedance When alone in an AC circuit, inductors, capacitors, and resistors all impede current. How do they behave when all three occur together? Interestingly, their individual resistances…
Learning Objectives By the end of this section, you will be able to: Many circuits also contain capacitors and inductors, in addition to resistors and an AC voltage source. We have seen how capacitors and inductors respond to DC voltage…
Learning Objectives By the end of this section, you will be able to: We know that the current through an inductor L cannot be turned on or off instantaneously. The change in current changes flux, inducing an emf opposing the change (Lenz’s…
Learning Objectives By the end of this section, you will be able to: Inductors Induction is the process in which an emf is induced by changing magnetic flux. Many examples have been discussed so far, some more effective than others.…
Learning Objectives By the end of this section, you will be able to: Electricity has two hazards. A thermal hazard occurs when there is electrical overheating. A shock hazard occurs when electric current passes through a person. Both hazards have already been discussed. Here…
Learning Objectives By the end of this section, you will be able to: Transformers do what their name implies—they transform voltages from one value to another (The term voltage is used rather than emf, because transformers have internal resistance). For example,…
Learning Objectives By the end of this section, you will be able to: It has been noted that motors and generators are very similar. Generators convert mechanical energy into electrical energy, whereas motors convert electrical energy into mechanical energy. Furthermore,…
Learning Objectives By the end of this section, you will be able to: Electric generators induce an emf by rotating a coil in a magnetic field, as briefly discussed in Induced Emf and Magnetic Flux. We will now explore generators in more…