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Review: Direct Current Circuits

AC vs DC Circuits

What are Phasors?

🔑 Phasors Aid In Analyzing (single frequency) AC

• Phasor Diagrams y(t) = y_max cos(ω t) or y(t) = y_max sin(ω t)
      [Be consistent: use either sin() or cos()]
• Impedance Z = R + j( X_L + X_C ) = |Z| e ^{j φ}     [Ω]
  • X_C = −(ωC)⁻¹   =   − (ω ε)⁻¹ (d/A)
  • X_L = +(ωL)⁺¹   =   + (ω μ)⁺¹ N² (A/l)
  • R = + ρ (d/A)
• tan( φ) = X/R

Outline

1. Phasor Diagram Fundamentals
2. emf + R
3. emf + C (ideal case)
4. emf + RC
5. emf + L (ideal case)
6. emf +RLC
7. Power in AC Circuits

Power Points (Ref: Knight vs 4 Ch 32)

View at Home: Phasors (Viby rolinychupetin):