CHAPTER 6

6.1 (a) Define alternating current (AC)

6.1 (b) Sketch and interpret sinusoidal AC waveform

6.1 (c) Use sinusoidal voltage and current equations, I = I₀ sin ωt & V = V₀ sin ωt

6.2 (a) Define root mean square (rms) current and voltage for AC source

6.2 (b) Use formula of rms current, Iᵣₘₛ = I₀/√2 and rms voltage, Vᵣₘₛ = V₀/√2

6.3 (a) Sketch and use phasor diagram and sinusoidal waveform to show the phase relationship between current and voltage for a single component circuit consisting of pure resistor, pure capacitor, and pure inductor

6.3 (b) Use phasor diagram to analyse voltage, current and impedance of series circuit of RL, RC and RLC

6.3 (c) Define and use capacitive reactance, inductive reactance, impedance and phase angle

6.3 (d) Explain graphically the dependence of R, X_C, X_L, and Z on f and relate it to resonance

6.4 (a) Apply the following in AC circuit consisting of R, RC, RL and RCL in series:

i. Average power, Pₐᵥ = IᵣₘₛVᵣₘₛ cos Φ (also known as power loss that only occurs in resistor)

ii. Instantaneous power, P = IV

iii. Power factor, cos Φ = Pᵣ/Pₐ = Pₐᵥ/Iᵣₘₛ Vᵣₘₛ