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| learn:courses:real-analog-chapter-12:start [2017/01/19 20:27] – [12.3: RMS Values] Martha | learn:courses:real-analog-chapter-12:start [2022/10/04 11:38] (current) – external edit 127.0.0.1 | ||
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| ====== Real Analog: Chapter 12 ====== | ====== Real Analog: Chapter 12 ====== | ||
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| + | * Chapter 12 Video: | ||
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| ====== 12. Introduction and Chapter Objectives ====== | ====== 12. Introduction and Chapter Objectives ====== | ||
| In this chapter we will address the issue of power transmission via sinusoidal (or AC) signals. This topic is extremely important, since the vast majority of power transmission in the world is performed using AC voltages and currents. | In this chapter we will address the issue of power transmission via sinusoidal (or AC) signals. This topic is extremely important, since the vast majority of power transmission in the world is performed using AC voltages and currents. | ||
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| $$P= \frac{V_m I_m}{2} \cos(\theta_v - \theta_i)$$ | $$P= \frac{V_m I_m}{2} \cos(\theta_v - \theta_i)$$ | ||
| - | The apparent power is $|fracV_m | + | The apparent power is $\frac{V_m |
| ==== Exercises ==== | ==== Exercises ==== | ||
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| * A small power factor means that a large portion of the power delivered by the power company to a user is in the form of reactive power. The user does not pay for reactive power, since it is essentially returned to the power company. The power company, however, incurs costs in exchanging reactive power with the user, since transmission of the reactive power results in power dissipation. Power companies, therefore, may require that a user meet a minimum power factor requirement. | * A small power factor means that a large portion of the power delivered by the power company to a user is in the form of reactive power. The user does not pay for reactive power, since it is essentially returned to the power company. The power company, however, incurs costs in exchanging reactive power with the user, since transmission of the reactive power results in power dissipation. Power companies, therefore, may require that a user meet a minimum power factor requirement. | ||
| * The power factor of an inductive load can be increased by placing a capacitor in parallel with the load. This process is called power factor correction. The goal is to increase the power factor without changing the average power delivered to the load. | * The power factor of an inductive load can be increased by placing a capacitor in parallel with the load. This process is called power factor correction. The goal is to increase the power factor without changing the average power delivered to the load. | ||
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