This unit involves the skills and knowledge required to determine correct operation of single source direct current (d.c.) series, parallel and series-parallel circuits and provide solutions to various electrotechnology work functions.
It includes working safely; using voltage, current and resistance measuring devices; and providing solutions to measurement and calculation problems derived from single and multiple path circuits.The skills and knowledge described in this unit require a licence or permit to practice in the workplace where work is carried out on electrical installations which are designed to operate at voltages greater than 50 volt (V) alternating current (a.c.) or 120 V d.c.
Assessment tasks will be designed to reinforce & extend knowledge and skill competence within set & controlled parameters in accordance with each unit’s learning outcomes & performance criteria requirements, incl the setting of work based practical application tasks designed to provide evidence of competence outcomes, within periodic and scheduled timelines.
Students will be expected to demonstrate the following required skills:
* altering an existing circuit to comply with specified operating parameters
* applying Ohm’s Law to solve problems in direct current (d.c.) single path circuits
* applying 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 material
* connecting analogue/digital ammeter into a circuit ensuring the polarities are correct to take current readings
* connecting a series d.c. circuit containing capacitor and resistor to determine the time constant of the circuit
* calculating quantities from given information to determine capacitance, energy and voltage
* calculating one time constant as well as the time taken to fully charge and discharge a given capacitor
* calculating equivalent capacitance of capacitors connected in series and parallel circuits
* dealing 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 resistance
* calibrating and using measuring device in accordance with manufacturer specifications
* determining the operating parameters of an existing circuit
* developing circuits to comply with a specified function and operating parameters
* identifying and applying electrical industry standard symbols to represent electrical components in circuit diagram
* identifying fixed and variable resistors, including:
* determining resistance of a colour coded resistor from colour code tables and confirming the value by measurement
* measuring resistance of variable resistors under varying conditions of light, voltage and/or temperature
* selecting a resistor for an application
* solving problems in series and series-parallel circuits, including:
* developing, setting up and connecting a single source d.c. series-parallel circuit
* measuring voltage and current
* calculating resistance, voltage, current and power from measured and/or given values of any two of these quantities in a single source series-parallel circuit
* using test equipment to confirm the effect of material length, cross-sectional area and temperature on the resistance of conductive materials
* selecting an appropriate meter in terms of units to be measured, range, loading effect and accuracy for a given application
* using measuring devices to Solve problems in direct current circuits
* using meters for problem solving, including measuring resistance using direct, volt-ammeter and/or bridge methods
* using methodical techniques to solve d.c. circuit problems from measured and calculated values.
The qualified trainer and assessor will advise students of class notes, reading materials produced by VU Polytechnic and further support via VU Polytechnic e-learning system and/or in person.
This unit is studied as part of the following course(s):