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Introduction .............................................................................. 2 Electron Theory........................................................................ 4 Conductors, Insulators and Semiconductors......................... 5 Electric Charges ....................................................................... 7 Current......................................................................................9 Voltage ....................................................................................11 Resistance .............................................................................. 13 Simple Electric Circuit ...........................................................15 Ohms Law..............................................................................16 DC Series Circuit ....................................................................18 DC Parallel Circuit .................................................................. 23 Series-Parallel Circuits ........................................................... 30 Power ......................................................................................34 Magnetism.............................................................................37 Electromagnetism .................................................................. 39 Introduction to AC .................................................................42 AC Generators ........................................................................44Frequency...............................................................................47 Voltage and Current ...............................................................48 Inductance ..............................................................................51 Capacitance ............................................................................56 Inductive and Capacitive Reactance ..................................... 61 Series R-L-C Circuit................................................................67 Parallel R-L-C Circuit ..............................................................69 Power and Power Factor in an AC Circuit ............................. 71 Transformers ..........................................................................75 Three-Phase Transformers .................................................... 80Review Answers ....................................................................83 Final Exam ..............................................................................84 1

Introduction

Welcome to the first course in the STEP 2000 series, Siemens Technical Education Program designed to prepare our distributors for the year 2000 and beyond. This course covers Basics of Electricity andis designed to prepare you for subsequent courses on Siemens Energy & Automation products. Upon completion of Basics of Electricity you will be able to:

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Explain the difference between conductors and insulators Use Ohms Law to calculate current, voltage, and resistance Calculate equivalent resistance for series, parallel, or series-parallel circuits Calculate voltage dropacross a resistor Calculate power given other basic values Identify factors that determine the strength and polarity of a current-carrying coils magnetic field Determine peak, instantaneous, and effective values of an AC sine wave Identify factors that effect inductive reactance and capacitive reactance in an AC circuit Calculate total impedance of an AC circuit Explain the difference betweenreal power and apparent power in an AC circuit

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Calculate primary and secondary voltages of singlephase and three-phase transformers Calculate kVA of a transformer

The objectives listed above may sound strange to you. You may also wonder why you would need to know these things to sell Siemens Energy & Automation products. Developing a basic knowledge of electrical concepts,...