LEARNING OUTCOMES
The Student Will
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| C | 1 | Describe Direct Current (DC) and Alternating Current (AC) and explain their source, characteristics and units of measurement. |
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| A | 2 | Describe the nature and characteristics of resistance, the various types of resistors, and draw circuit diagrams and perform calculations and measurements related to typical series and parallel circuits |
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| A | 3 | Describe the nature and characteristics of capacitance, the various types of capacitors, and draw circuit diagrams and perform calculations and measurements related to typical series and parallel circuits |
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| A | 4 | Describe the nature and characteristics of inductance, the various types of inductor, and draw circuit diagrams and perform calculations and measurements related to typical series and parallel circuits |
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| A | 5 | Describe the nature and characteristics of a transformer and their application in simple circuits, including the maximum power transfer theorem, and perform voltage and current calculations that include the turns ratio. |
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| C | 6 | Describe and explain the physical properties of magnetism and magnetic materials, and inductance and electromagnetic induction, |
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| together with simple applications. |
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| A | 7 | Describe the principles of operation of basic electrical test equipment, including the oscilloscope and those employing a moving coil and demonstrate an ability to perform measurements on simple circuits. |
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| A | 8 | Describe the mechanics of AC generation and the characteristics and parameters of AC sinusoidal voltage and current and measure these parameters. |
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| A | 9 | Perform AC calculations on series and parallel circuts that include resistors, capacitors and inductors both individually and in combination. |
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| C | 10 | Explain the operation of simple unregulated Power Supplies Units (PSU) and discuss the type of PSU that is commonly used in a Personal Computer. |
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| Describing the nature and characteristics of resistance, various types of resistors, and drawing circuit diagrams and performing calculations and measurements related to typical series and parallel circuits includes: |
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| > | Atomic valency tables and characteristics of materials that have insulation, semi-conduction or resistive qualities. |
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| > | Effects that length, diamenter, temperature and resistivity have on the resistance of a material. |
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| > | Range of resistors available commercially including values, tolerance, wattage and voltage rating and colour codes |
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| > | Drawing circuit diagrams and using OHMS Law to perform calculations relating to current, potential difference and resistance in simple series and parallel resistive circuits. |
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| > | Using a range of different Multi-test Meters to measure current, voltage and resistance in a circuit. |
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| > | Using appropriate equations to calculate the total resistance of resistors connected in series and in parallel. |
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| > | Applying a proof to demonstrate that the sum of the potential differences across each resistor in a series circuit is equal to the supply voltage. |
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| > | Applying a proof to demonstrate that the sum of the currents that flow in the arms of a parallel circuit is equal to the total current flowing into that circuit, and that the potential difference across each arm is the same. |
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| > | Calculating power consumption in resistive circuits using three different Power formulae |
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| Describing the nature and characteristics of capacitance, the various types of capacitors, and drawing circuit diagrams and performing calculations and measurements related to typical series and parallel circuits will include: |
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| > | Defining capacitance and stating the units of measurement. |
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| > | The affect of the area of the plates, the distance between the plates and the medium (dielectric) that separates the plates on the capacity of a capacitor and its voltage rating. |
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| > | The electric field that is developed between the plates of a capacitor, its relationship to the applied voltage, the dielectric and its ability to store energy. |
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| > | Defining permittivity and the dielectric constant. |
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| > | Calculating the total capacitance of capacitors connected in series, and in parallel. |
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| > | Range of capacitors available commercially including their value, tolerance and voltage rating and codes used to identify them, and their application in practical electronic circuits. |
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| > | Constructing and testing an R C circuit that will deliver a specified time constant |
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| Describing the nature and characteristics of inductance, the various types of inductor, and drawing circuit diagrams and performing calculations and measurements related to typical series and parallel circuits includes: |
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| > | Defining inductance and stating the units of measurement. |
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| > | The effect by the number of turns, the diameter of the wire, the permeability of the core and the area and length of the core on the value of the inductor and its wattage rating |
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| > | The magnetic field developed around the coils of wire, its relationship to the current flowing, and the inductor’s ability to store energy. |
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| > | Calculating the total inductance of inductors connected in series and in parallel. |
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| > | Range of inductors commercially available including their value, tolerance, wattage and voltage rating and the codes used to identify them, and their application in practical electronic circuits. |
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| > | Constructing and testing an R L circuit that will deliver a specified time constant |
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| Describing the nature and characteristics of transformers and their application in simple circuits, including the maximum power transfer theorem, and performing | voltage and current calculations includes: |
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| > | Stating the physical and electrical conditions that exist in an ideal transformer. |
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| > | Performing calculations that show the relationships between the turn’s ratio and the input / output voltage, current, impedance and wattage. |
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| > | Describing the use of a transformer for impedance matching and for the maximum power transfer |
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| > | Testing the operation of a transformer in a simple circuit |
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| Describing and explaining the physical properties, of magnetism and magnetic materials, and inductance and electromagnetic induction together with simple applications includes: |
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| > | Defining the terms permeability, reluctance, flux, flux density, m.m.f. and magnetising force and the relationship between flux density and field strength |
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| > | Relationship between a magnetising force and the resultant field strength including the units of measurement and identifying how the analysis of a B H graph allows the selection of a suitable magnetic material for a particular application. |
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| > | Relationship between the current in a conductor and the magnetic field generated and a practical application |
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| > | Defining the value of inductance of an inductor in terms of its ability to store energy in its magnetic field. |
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| > | Types of magnetic field patterns produced by bar magnets and solenoids. |
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| > | The affect that a magnetic field has on a current-carrying conductor |
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| > | Electromagnetic induction, self induction, mutual induction and Lenz’s Law. |
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| > | Identifying the relationship between electromagnetic induction and the principles of operation of motors, generators and transformers. |
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| Describing the principles of operation of basic electrical test equipment, including the oscilloscope and those that employ a moving coil and demonstrating an ability to perform measurements in simple circuits includes: |
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| > | The operation of a moving coil meter and its application in a Volt and Current meter and in an Ohm meter. |
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| > | Using moving coil multi-test meters to accurately measure current, voltage and resistance in simple circuits. |
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| > | Comparing and contrasting moving coil and electronic multi-test meters in terms of accuracy, their affect on the circuit being tested, cost, and their simplicity of operation. |
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| > | Using a CRO to observe waveforms and measure ac and dc voltages. |
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| Describing the mechanics of AC generation and the characteristics and parameters of AC sinusoidal voltage and current and measuring these parameters includes: |
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| > | Identifying a device that converts electrical energy into mechanical energy. |
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| > | Describing the principles of operation and stating a practical application of a solenoid. |
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| > | Principles of operation and a practical application of stepping motors. |
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| > | Simple method of converting mechanical energy into electrical (AC) energy, and graphing the output waveform. |
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| > | Sketching a sinusoidal waveform and identifying the period, peak voltage, the peak to peak voltage and the phases and representing it as a mathematical expression. |
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| > | Calculating the peak and peak–to-peak amplitude, the period, the frequency, the r m s. the average and the instantaneous values of voltage or current in a sinusoidal waveform representing AC. |
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| > | Using vector representation and algebraic expressions to resolve problems that involve sinusoidal A C. |
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| > | Using graphical or software techniques to determine the resultant waveforms of the addition of two sinusoidal voltages, when one is either twice or three times the fundamental frequency |
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| Describing, discussing and performing AC calculations on series and parallel circuts that include resistors, capacitors and inductors individually and in combination includes: |
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| > | Stating the relationship between voltage and current in circuits that are purely resistive or inductive or capacitive. |
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| > | Drawing phasor (vector) diagrams showing the relationship between voltage and current waveforms in circuits that are purely resistive or inductive or capacitive. |
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| > | Defining inductive and capacitive reactance and solving simple inductive and capacitive reactance problems. |
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| > | Solving simple AC problems that include a combination of R and C or R and L using phasor (vector) diagrams. |
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| > | Defining Impedance. |
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| > | Solving simple A C problems that include R, C and L in combination |
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| > | Solving simple Impedance problems that include R, C and L singularly and in combination using | phasor (vector) diagrams. |
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| > | Calculating power in an A.C. circuit that has a resistive load. |
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| > | Calculating true and apparent power in AC circuits that contain a reactive load. |
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| > | Discussing Power Factor and Power Factor correction. |
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| > | Deriving the power triangle from the voltage triangle. |
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| > | Defining series resonance and describing impedance and the phase relationship that exists between current and voltage at resonance. |
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| > | Deriving the formula and calculating the series resonant frequency of an AC circuit that contains L and C. |
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| > | Drawing response curves of series resonant circuits and performing calculations illustrating that at resonance VL and Vc may be many times supply Vs |
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| > | Defining the Q-factor in terms of voltage magnification in series circuit and describing the advantages and disadvantages of a high Q-factor in series power circuits. |
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| > | Defining parallel resonance and describing its impedance and the phase relationship that exists between current and voltage at resonance. |
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| > | Deriving the formula and calculating the parallel resonant frequency of an AC circuit that contains L and C. |
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| > | Drawing response curves of parallel resonant circuits. |
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| > | Defining the term bandwidth in the context of resonant circuits. |
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| > | Defining selectivity and the effect that R has at resonance. |
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| > | Describing the practical application of resonant circuits in radio. |
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| Note |
| > | The topics are not listed in the order in which they are to be taught. Magnetism and Electromagnetic Induction must be taught before Inductors and Transformers. |
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| > | The mathematical approach to AC problem solving should follow the recommended textbook. A mathematical approach to conduction, admittance and susceptance should not be used. |
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| > | Where students are required to define something it is expected that they will do so in their own words rather than replicate what is in the textbook. They will not be expected to use a mathematical expression in their definition. |
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| > | At least 25% of the assessment should be in the form of practical tests. |
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| > | At least 25% of the Class Contact Time (CCT) should involve developing practical skills and laboratory exercises. |
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| > | Laboratory exercises may be completed in teams consisting of two students. |
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| > | Students should be encouraged to explore the local shops and the internet when completing the exercise designed to review the range of batteries that are available on the market. |
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| LEARNING RESOURCES |
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| Equipment: |
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| An Electronics Laboratory that includes class sets of: |
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| > | Multi-Test Meters both Moving-coil and Analogue / Digital Electronic |
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| > | Audio Signal Generators |
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| > | Oscilloscopes |
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| > | Low voltage Power Supply Units (PSUs) |
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| > | Soldering Irons and stands |
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| > | Electronic Component experiment boards |
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| > | Resistor Substitution Boxes |
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| > | Capacitor Substitution Boxes |
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| > | Wired 230v to 12v and 6 volt AC mains transformer boxes |
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| > | Personal Computers (PCs) |
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| > | Crocodile-Clips, or similar software |
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| > | Tool Kits |
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| > | 230v AC wired Work-benches |
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| Reference Material |
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| > | Primary Reference Book: Electronics A Basic Course, Rodney C. L. Meyer, Revised Edition, McGraw and Hill, Auckland, 1999. |
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| > | Secondary Reference Book: Electronic Devices, Thomas L. Floyd, Sixth Edition, Prentice-Hall, London, 2002. |
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