copyright © by nccer, published by pearson education, inc. electrical level two – alternating...

Copyright © by NCCER,Published by Pearson Education, Inc.

Electrical Level Two – Alternating CurrentModule 26201-11

National Center for Construction Education and

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Alternating CurrentModule 26201-11




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Upon completion of this module, you will be able to do the following:

1. Calculate the peak and effective voltage or current values for an AC waveform.

2. Calculate the phase relationship between two AC waveforms.3. Describe the voltage and current phase relationship in a resistive AC circuit.4. Describe the voltage and current transients that occur in an inductive circuit.5. Define inductive reactance and state how it is affected by frequency.6. Describe the voltage and current transients that occur in a capacitive circuit.7. Define capacitive reactance and state how it is affected by frequency.8. Explain the relationship between voltage and current in the following types of

AC circuits: • RL circuit • RC circuit • LC circuit • RLC circuit9. Explain the following terms as they relate to AC circuits: • True power • Apparent power • Reactive power • Power factor10. Explain basic transformer action.

Objectives




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Slide 3 Figure 1 – Conductor moving across a magnetic field




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Slide 4 Figure 2 – Angle versus rate of cutting lines of flux




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Slide 5 Figure 3 – One cycle of alternating voltage




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Slide 6 Figure 4 – Frequency measurement




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Slide 7 Figure 5 – Amplitude values for a sine wave




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Slide 8 Figure 6 – Voltage waveforms 90° out of phase




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Slide 9 Figure 7 – Waves in phase




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Slide 10 Figure 8 – AC waveforms




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Slide 11 Figure 9 – Resistive AC circuit




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Slide 12 Figure 10 – Voltage and current in a resistive AC circuit




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Slide 13 Figure 11 – Factors affecting the inductance of a coil




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Slide 14 Figure 12 – Inductor voltage and current relationship




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Slide 15 Figure 13 – Capacitors




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Slide 16 Figure 14 – Charging and discharging a capacitor




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Slide 17 Figure 15 – Capacitors in parallel




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Slide 18 Figure 16 – Capacitors in series




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Slide 19 Figure 17 – Voltage and current in a capacitive AC circuit




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Slide 20 Figure 18 – Summary of AC circuit phase relationships




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Slide 21 Figure 19 – Series RL circuit and vector diagram




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Slide 22 Figure 20 – Series RL circuit with waveforms and vector diagram




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Slide 23 Table 1 – Series R and XL Combinations




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Slide 24 Figure 21 – Parallel RL circuit with waveforms and vector diagram




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Slide 25 Table 2 – Parallel R and XL Combinations




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Slide 26 Figure 22 – Series RC circuit with vector diagrams




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Slide 27 Table 3 – Series R and XC Combinations




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Slide 28 Figure 23 – Parallel RC circuit with vector diagrams




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Slide 29 Table 4 – Parallel R and XC Combinations




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Slide 30 Figure 24 – Series LC circuit with vector diagram




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Slide 31 Figure 25 – Parallel LC circuit with vector diagram




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Slide 32 Figure 26 – Series RLC circuit and vector diagram




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Slide 33 Figure 27 – Parallel RLC circuit and vector diagram




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Slide 34 Figure 28 – Power calculations in an AC circuit




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Slide 35 Figure 29 – RLC circuit calculation




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Slide 36 Figure 30 – Power triangle




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Slide 37 Figure 31 – Basic components of a transformer




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Slide 38 Figure 32 – Transformer action




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Slide 39 Figure 33 – Steel laminated core




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Slide 40 Figure 34 – Cutaway view of a transformer core




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Slide 41 Figure 35 – Transformer winding polarity




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Slide 42 Figure 36 – Transformer turns ratio




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Slide 43 Figure 37 – Tapped transformers




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Slide 44 Figure 38 – Importance of an isolation transformer




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Slide 45 Figure 39 – Autotransformer schematic diagram




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Slide 46 Figure 40 – Current transformer schematic diagram




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Slide 47 Figure 41 – Potential transformer.




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Slide 48

Supplemental Art




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Slide 49 Course Map




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Slide 50 Left-Hand Rule for Generators




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Slide 51 RMS Amplitude




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Slide 52 What’s Wrong With This Picture?




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Slide 53 AC Circuits




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Slide 54 Turns and Voltage Ratios




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Slide 55

copyright © by nccer, published by pearson education, inc. electrical level two – alternating...

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