Second, there is a protective case around the appliance, such as a toaster or refrigerator. First is the familiar circuit breaker (or fuse) to prevent thermal overload. Modern household and industrial wiring requires the three-wire system, shown schematically in Figure 6.32, which has several safety features. This is not how power is distributed in practice. Here we will concentrate on systems and devices that prevent electrical hazards.įigure 6.31 shows the schematic for a simple AC circuit with no safety features. Both hazards have already been discussed. A shock hazard occurs when electric current passes through a person. A thermal hazard occurs when there is electrical overheating. 4.E.2.1 The student is able to construct an explanation of the function of a simple electromagnetic device in which an induced emf is produced by a changing magnetic flux through an area defined by a current loop (i.e., a simple microphone or generator) or of the effect on behavior of a device in which an induced emf is produced by a constant magnetic field through a changing area. ![]() ![]() The information presented in this section supports the following AP® learning objectives and science practices: ![]()
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