By Paul Rosenberg
An crucial source for passing electrician's examinations
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A trustworthy and relied on source for lots of many years, this most recent variation can provide the entire very important content material electricians have to made the grade and boost their careers.
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Additional resources for Audel Questions And Answers For Electrician's Examinations
1-34 What is a service cable? A service conductor manufactured in the form of a cable and normally referred to as SE cable, or USE cable (see the NEC, Article 338). 1-35 What is meant by “service drop”? The overhead conductors from the last pole or other aerial support to and including the splices, if any, connecting to the service-entrance conductors at the building or other structure. If there is a service pole with a meter on it, such as a farm service pole, the service drop does not stop at the service pole; all wires extending from this pole to a building or buildings are service drops, as well as the conductors from the last line pole to the service pole (see the NEC, Article 100 and Article 230, II).
Under most circumstances, this is a local electrical inspector. 1-43 What is meant by a “general-use switch”? A device intended for use as a switch in general distribution and branch circuits. It is rated in amperes and is capable of interrupting its rated current at its rated voltage. 1-44 What is meant by a “T-rated switch”? An AC general-use snap switch that can be used (a) on resistive and inductive loads that don’t exceed the ampere rating at the voltage involved, (b) on tungsten-filament lighting loads that don’t exceed the ampere rating at 120 volts, and (c) on motor loads that don’t exceed 80% of their ampere rating at the rated voltage.
E = I1R1 + R2 + R32 = 2110 + 15 + 302 = 2 * 55 = 110 volts Parallel Circuits In a parallel, or divided, circuit such as that shown in Figure 2-2, the same voltage appears across each resistance in the group; the current flowing through each resistance is inversely proportional to the value of the resistance. The sum of all the currents, however, is equal to the total current leaving the battery. Thus: E = I1R1 = I2R2 = I3R3 and, I = I1 + I2 + I3 TLFeBOOK 62 Chapter 2 I3 R3 I2 I3 R2 I1 I2 R1 I I1 E ϩ I Ϫ RT ϭ IT ϭ I1 ϩ I2 ϩ I3 Figure 2-2 1 1 1 ϩ ϩ R 1 R2 R3 ET ϭ IT ϩ 1 RT Resistances in parallel.