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Electricity Two:
 
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TOPICS
OBJECTIVES - LEARNER WILL BE ABLE TO:

SINUSOIDAL ALTERNATING WAVE FORM

  • Generation of AC
  • Sine wave, frequency period
  • Sine wave, voltage and current values


  • Given an AC meter reading of sine wave voltage, current, convert to peak to peak value, RMS. and average value.
  • Relate frequency and time period for an AC signal.
  • Define amplitude, alternation, cycle, wavelength and phase relationship in sine waves.
  • Use an oscilloscope to observe AC wave form.

THE BASIC ELEMENTS AND PHASORS:

  • E & I phase relations in resistive and reactive circuits
  • Inductance, XL.
  • Capacitance, XC
  • Ohm's Law in AC circuits
  • Phase representation if E & I
  • Rectangular and Polar forms
  • Operator "J"
  • Rate of change of current.

  • State the AC form of Ohm's Law used with either capacitive or inductive reactance.
  • Given two or more inductive or capacitive reactance in series, or parallel specify the effective reactance if the combination.
  • Describe the distinction between a vector and a phasor.
  • Describe what is meant by: Algebraic solution, Pythagorean addition, Polar coordinates, Rectangular coordinates.
  • Demonstrate understanding of complex numbers by converting quantities from Polar form into Rectangular form and vice versa.

SERIES CIRCUITS:

  • Impedance of RL, RC, and RLC circuits
  • Frequency response

  • Write an expression that will permit calculation of the magnitude of an impedance formed by a resistor and either an inductor or a capacitor in series.
  • Plot the voltage and current of series R-L or RLC network Vs frequency.

PARALLEL CIRCUITS:

  • Admittance of RL, RC, and RLC circuits
  • Frequency response
  • R-L-C components experiment
  • Frequency response of series R-L network

  • Given an arbitrary parallel circuit containing variable resistance and reactance, supplied by a variable frequency AC source and supply voltage, analyze the behavior of the parallel circuit when one of the variable parameter is change.
  • Plot the voltage and current of a series R-C network versus frequency.

POWER IN AC:

  • Power in pure R, L, and C circuit
  • Power in RL and RC circuits
  • Power factor
  • Power factor correction
  • Sinusoidal experiment
  • Discuss the energy flow in and out of pure resistance, pure reactance, and impedance containing reactance and resistance.
  • Given the specification of a complex impedance that loads an AC source, calculate the power factor.
  • Analyze a network with all there elements, R, L and C
  • Verify the voltage divider rule through actual measurements.
  • Determine the input impedance using experimental methods

SERIES RESONANCE:

  • Effect of frequency change on a series RLC circuit
  • Resonance
  • (Q) of resonant circuit
  • Selectivity

  • Given a series circuit containing R, L, and C and supplied by an AC source with variable voltage and frequency, analyze the behavior of the circuit when the frequency is varied.
  • Describe the following concepts of resonance curve: (Bandwidth, voltage magnification, selectivity, quality factor Q, resonant frequency, L/C ratio, half power points of the circuit.
  • Verify Kirchhoff's current law through actual measurements.

PARALLEL RESONANCE:

  • Effect of frequency change on a parallel RLC circuit
  • (Q) of resonant circuit
  • Selectivity

  • Given a parallel resonant circuit, qualitatively specify the character of the impedance at frequencies below resonance, at resonance, and above resonance.
  • Given inductive reactance of the coil and its effective resistance, calculate the (Q) of the coil.

MAGNETIC CIRCUITS:

  • Magnetic fields
  • Magnetic properties
  • Magnetic hysteresis
  • Electromagnetism
  • Describe how an electromagnet can be produced.
  • Describe the relationship between flux density B and magnetizing force (H).
  • Define permeability and its unit, reluctance and its unit, and hysteresis and draw + explain (B - H)

IRON CORE TRANSFORMERS:

  • Mutual induction
  • Turn ratio
  • Impedance transformation
  • Effects of loading
  • Auto transformers


  • Given a total power input to a transformer and the total power delivered to a load, calculate the efficiency of the transformer.
  • Demonstrate how the input impedance varies with frequency and validate the relationship between the quality factor of a network and the bandwidth.
  • Plot the voltage and source current (constructed) versus frequency.

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