By Brian Elliott
Grasp the main components of electromechanical parts necessary to the layout, fix, or operation of your electromechanical units, this quick-find reference offers illustrations, descriptions, and suitable calculations for 2,000 time-tested electromechanical parts.
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Extra resources for Electromechanical Devices & Components Illustrated Sourcebook
When the switch is open, as shown in Figure 1-2, the ﬂow of electrons is interrupted and the lamp is off. This mode is usually referred to as an open circuit. To turn the lamp on, the switch is closed and the electrons can ﬂow again, as shown in Figure 1-3. This mode is generally referred to as a closed circuit. The switch provides ready convenience in operating the circuit. + − Electron Flow Battery Light Bulb Light Bulb Figure 1-1 Basic Electric Circuit Battery Knife Switch Light Bulb Figure 1-3 Closed Circuit Voltage, Current, and Resistance Now that we have an understanding of the basic electric circuit, there are a few items that will provide us with a better working knowledge of how electricity does what it does.
If a fuse is printed with 15 it is designed to carry a maximum current of 15 amps. The third, and least known, parameter is resistance. Resistance is just what the word implies, resistance to the ﬂow of electricity. The unit of measure for resistance is ohms. Since resistance is what allows us to extract work from an electrical circuit, it is an exceptionally important parameter to understand. ) + − Electron Flow Heat Battery Knife Switch Resistor (ohms) Figure 1-4 Voltage, Current, and Resistance Figure 1-4 shows how these different parameters apply to our basic electric circuit.
Additionally, 120 volts is a common control voltage in industrial equipment where it is used primarily to limit the current and, consequently, the wire size that is used for the circuit of equipment. Voltage of 240 volts is typically supplied to homes. This voltage can be reduced to 120 volts for use in the home’s outlets. Major appliances and larger motors will generally operate on 240 volts. The higher voltage provides the same power with lower current and, therefore, smaller wire. It should be noted that 240 volts represents a signiﬁcant shock hazard.
Electromechanical Devices & Components Illustrated Sourcebook by Brian Elliott