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Mastering AC Resistive Circuits: Phase Relationships & Power Calculations

This chapter delves into phase relationships, Ohm's law application, and power calculations in AC resistive circuits. Learn to solve for unknown quantities in series and parallel setups. Explore the in-phase relationships of voltage and current, and understand the effective values for AC. Enhance your understanding of resistive loads in basic AC circuits.

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Mastering AC Resistive Circuits: Phase Relationships & Power Calculations

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  1. Chapter 14 Resistive AC Circuits

  2. Objectives • After completing this chapter, you will be able to: • Describe the phase relationship between current and voltage in a resistive circuit • Apply Ohm’s law to AC resistive circuits • Solve for unknown quantities in series AC resistive circuits

  3. Objectives (cont’d.) • Solve for unknown quantities in parallel AC resistive circuits • Solve for power in AC resistive circuits

  4. Basic AC Resistive Circuits Figure 14-1. A basic AC circuit consists of an AC source, conductors, and a resistive load.

  5. Basic AC Resistive Circuits (cont’d.) Figure 14-2. The voltage and current are in phase in a pure resistive circuit.

  6. Series AC Circuits Figure 14-3. Simple series AC circuit.

  7. Figure 14-4. The in-phase relationship of the voltage drops, applied voltage, and current in a series AC circuit.

  8. Parallel AC Circuits Figure 14-5. A simple parallel AC circuit.

  9. Figure 14-6. The in-phase relationship of the applied voltage, total current, and individual branch currents in a parallel AC circuit.

  10. Power in AC Circuits Figure 14-7. The relationship of power, current, and voltage in a resistive AC circuit.

  11. Summary • A basic AC circuit consists of an AC source, conductors, and a resistive load • The voltage and current are in phase in a pure resistive circuit • The effective value of AC current or voltage produces the same results as the equivalent DC voltage or current

  12. Summary (cont’d.) • Ohm’s law can be used with all effective values • AC voltage or current values are assumed to be the effective values if not otherwise specified

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