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Elements and Performance Criteria
- Identify d.c. electrical circuits
- Work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures for a given work area are identified and applied
- Tools, equipment and circuit measuring devices required for the electrical work are obtained and checked for correct operation and safety in accordance with workplace procedures
- Electrical apparatus is visually inspected, and components and circuits are identified
- Determine electrical d.c. circuit problem
- Need to test or measure live electrical work is conducted in accordance with WHS/OHS workplace safety procedures and regulatory requirements
- Circuits are checked and isolated in accordance with workplace procedures and regulatory requirements
- Expected circuit parameters are calculated from relevant component ratings/specifications
- Circuit parameters are measured in accordance with industry standards and checked against expected values
- D.c. circuit problems are assessed from measured and calculated values using established methodologies as they apply to circuits
- Circuit solutions are determined from measured and calculated values of resistance, voltage, current and power in series, parallel, and series-parallel circuits in accordance with industry standards
- Solutions are tested in accordance with workplace procedures and industry standards
- Problems are resolved without damage to apparatus, circuits, the surrounding environment or services using sustainable energy practices
- Unplanned situations are responded to in accordance with workplace procedures in a manner that minimises risk to personnel and equipment
- Complete work and document problem-solving activities
- Worksite is cleaned and made safe in accordance with workplace procedures
- Justification for solutions used to resolve circuit problems is documented
- Work completion is documented, electrical drawings are updated, and relevant person/s notified in accordance with workplace procedures
Range Statement
Performance Evidence
Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria on at least two separate occasions and include: |
altering an existing circuit to comply with specified operating parametersapplying Ohm’s Law to solve problems in direct current (d.c.) single path circuitsapplying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements, including identifying risks and applying risk control measures calculating resistance of a conductor from factors such as conductor length, cross-sectional area, resistivity and changes in temperature and materialconnecting analogue/digital ammeter into a circuit ensuring the polarities are correct to take current readingsconnecting a series d.c. circuit containing capacitor and resistor to determine the time constant of the circuitcalculating quantities from given information to determine capacitance, energy and voltagecalculating one time constant as well as the time taken to fully charge and discharge a given capacitorcalculating equivalent capacitance of capacitors connected in series and parallel circuitsdealing with unplanned events in accordance with workplace procedures in a manner that minimises risk to personnel and equipment demonstrating graphical relationships of voltage, current and resistancecalibrating and using measuring device in accordance with manufacturer specificationsdetermining the operating parameters of an existing circuitdeveloping circuits to comply with a specified function and operating parameters identifying and applying electrical industry standard symbols to represent electrical components in circuit diagramidentifying fixed and variable resistors, including:determining resistance of a colour coded resistor from colour code tables and confirming the value by measurementmeasuring resistance of variable resistors under varying conditions of light, voltage and/or temperatureselecting a resistor for an applicationsolving problems in series and series-parallel circuits, including:developing, setting up and connecting a single source d.c. series-parallel circuitmeasuring voltage and currentcalculating resistance, voltage, current and power from measured and/or given values of any two of these quantities in a single source series-parallel circuitusing test equipment to confirm the effect of material length, cross-sectional area and temperature on the resistance of conductive materialsselecting an appropriate meter in terms of units to be measured, range, loading effect and accuracy for a given applicationusing measuring devices to Solve problems in direct current circuitsusing meters for problem solving, including measuring resistance using direct, volt-ammeter and/or bridge methodsusing methodical techniques to solve d.c. circuit problems from measured and calculated values. |
Knowledge Evidence
Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of: |
electrical concepts, including:calculations involving quantity of electricity, velocity and speeddistribution of electricity from the source to the load via the transmission systemsprinciple of conservation of energyproduction of electricity, including: renewable and non-renewable energy sourcesstatic and current electricityutilisation of electricity by the various loadselectrical circuit, including: industry standard symbols used to represent components in an electrical circuit diagrammultiple and sub-multiple unitspurpose of each component in the electrical circuitOhm’s Law, including:d.c. single path circuitdetermining voltage, current and resistance in a circuiteffects of an open circuit, a closed circuit and a short circuit on a d.c. single pathrelationship between voltage and current from measured values in a circuitgraphical relationships of voltage, current and resistancerelationship between voltage, current and resistancevoltage and current levels in a d.c. single path circuitelectrical power, including:effects of power rating of various resistorsmethods for measuring of electrical power in a d.c. circuitpower dissipated in circuit from voltage, current and resistance valuespower ratings of electrical devicesrelationship between force, power, work and energyeffects of electrical current, including:relevant industry standards relating to fundamental principles for protection against the damaging effects of currentmechanisms by which metals corrodeprinciples by which electric current can result in the production of:heatmagnetic fieldsa chemical reactiontypical uses of electrical currentphysiological effects of currentelectromotive force (EMF) sources and conversion of electrical energy, including:input, output, efficiency and losses of electrical systems and machinesprinciples of generating an EMF, including:when a mechanical force is applied to a crystalwhen moving a conductor in a magnetic fieldby the application of light falling on the surface of photovoltaic (PV) cellsfrom the heating of one junction of a thermocoupleprinciples of producing an electrical current from primary, secondary and fuel cellsresistors, including:types and applications of fixed and variable resistors used in the electrotechnology industrycharacteristics of variable resistors used in the electrotechnology industry, including:adjustable resistors: potentiometer and rheostatlight dependent resistor (LDR)voltage dependent resistor (VDR)temperature dependent resistorpower ratings of a resistorpower loss (heat) occurring in a conductorresistor colour code tablesseries, parallel, and series-parallel circuits, including:applications where these circuits are used in the electrotechnology industrycharacteristics of series, parallel, and series-parallel circuits, including:connection of loadscurrent pathvoltage dropspower dissipationeffects of an open circuitdiagrams of single source d.c. series, parallel, and series-parallel circuitsidentification of the components of series, parallel, and series-parallel circuits, including power supply, loads, connecting leads and switchrelationship between voltage drops and resistance in a simple voltage divider networktechniques for determining voltage, current, resistances or power dissipated from measured or given values (of any two of these quantities)relationship between branch currents and resistances in a two-branch parallel and series-parallel current divider networkfactors affecting the resistance of a conductor, including:conductor lengthcross-sectional arearesistivitychanges in temperature and materialeffect the change in cross-sectional area, length and type of material has on the resistance of a conductoreffects of resistance on the current-carrying capacity and voltage drop in cableseffects of temperature change on the resistance of various conducting materialseffects of measuring devices in a circuit, including:advantages and disadvantages of each voltage indicator testercalibration and use of the measuring devicemethods for connecting an analogue/digital voltmeter into a circuit ensuring the polarities are correct and taking various voltage readingscorrect techniques to read the scale of an analogue meters and how to reduce the ‘parallax’ errorhazards associated with the use of measuring devices, including polarity hazards involved in using electrical instruments and the safety control measures that should be takeninstruments used in the field to measure voltage, current, resistance and insulation resistance and the typical circumstances in which they are usedmethods for using insulation resistance measuring devices to relevant industry standardsloading effect of various voltmeters when measuring voltage across various loadsmethods for measuring resistance using direct, volt-ammeter and bridge methodsnon-contact voltage indicator types and useoperating characteristics of analogue and digital metersconnecting an analogue/digital voltmeter into a circuit ensuring the polarities are correct and taking various voltage readingsoperation of various voltage indicator testerspurpose and characteristics of a voltmeterpurpose of an ammeter and the correct connection (series) of an ammeter into a circuitreasons the internal resistance of an ammeter must be extremely low and the dangers and consequences of connecting an ammeter in parallel and/or wrong polaritymethods for selecting an appropriate meter in terms of units to be measured, range, loading effect and accuracy for a given applicationtypes of voltage indicator testers, including light-emitting diode (LED), neon, solenoid, volt-stick and series tester and the purpose of each voltage indicator testermethods for using voltage indicator testers to detect the presence of various voltage levelscapacitors and capacitance, including:construction of a standard capacitordifferent types of dielectric material and each dielectric’s relative permittivitytypes of capacitors commonly used in the electrotechnology industry industry standard symbol of various types of capacitors, including standard, variable, trimmer and polarisedterms and units for capacitance, electric charge and energyfactors affecting capacitance behaviour of a series d.c. circuit containing resistance and capacitance components. - charge and discharge curvesarrangement of a series d.c. circuit containing capacitance and resistor to determine the time constant of the circuitcapacitors in series and parallel, including:application of capacitors in the electrotechnology industrycommon faults in capacitorsarrangement of capacitors in series and/or parallel configurations to achieve various capacitance valuesequivalent capacitance of capacitors connected in series and paralleleffects of capacitors connected in parallel by calculating their equivalent capacitanceeffects on the total capacitance of capacitors connected in series by calculating their equivalent capacitancehazards involved in working with capacitance effects and the safety control measures that should be taken, including safe handling and the correct methods of discharging various size capacitors, dangers of a charged capacitor and the consequences of discharging a capacitor through a persontesting of capacitors to determine serviceability. |