Unit of competency Outline

Date retreived
22/07/2026 1:20 AM AWST

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Apply basic principles of marine electrotechnology

Apply basic principles of marine electrotechnology

Unit of competency
National Code
MARL010
State Code
AUG30
TGA Status
Replaced
DTWD Status
Replaced
Current Release Number
1.00
Current Release Date
27/02/2015
View on TGA
State Implementation and Classification
Approved Date
28/08/2015
Field of Education
031701 - Maritime Engineering
Original Release Date
28/08/2015
Nominal Hours
50
Description
This unit involves the skills and knowledge required to explain basic marine electrotechnology principles and to perform basic electrical calculations.This unit applies to the work of Marine Engineering Watchkeepers on commercial vessels greater than 750 kW.This unit forms part of the requirements for the Certificate of Competency Marine Engineer Watchkeeper issued by the Australian Maritime Safety Authority (AMSA).
Notes
Elements and Performance Criteria
1 Explain how material properties affect resistance of electrical conductors
  • 1.1 Terms and symbols used in the formula for resistivity are used correctly
  • 1.2 How resistance varies with changes in conductor length and cross sectional area is outlined
  • 1.3 How resistance varies with temperature is outlined
  • 1.4 Calculations are performed that illustrate how material properties affect resistance of electrical conductors
2 Apply Ohm’s Law to electrical circuits
  • 2.1 Main sources of EMF are identified
  • 2.2 Terms and symbols used in Ohm’s Law are used correctly
  • 2.3 Calculations are performed using Ohm’s Law to solve problems involving internal, external and variable resistances in both series and parallel circuits
  • 2.4 Calculations are performed to determine power required and /or energy expended by electrical devices
  • 2.5 Circuits for a wheatstone bridge and a slide wire bridge are sketched and their application on a ship is outlined
  • 2.6 Calculations are performed dealing with resistances, currents and voltage drops in bridge circuits under null or balanced conditions
3 Apply principles of electrolytic action to electrical cells
  • 3.1 How the theory of electrolytic disassociation when applied to common electrolytic solutions and electrode materials explains the generation of EMF from chemical sources, is outlined
  • 3.2 Primary cells are distinguished from secondary cells
  • 3.3 Calculations are performed to solve problems involving currents, voltage drops and terminal potential difference of cells connected to form batteries in series and in parallel
  • 3.4 How capacity of a battery is measured is explained
  • 3.5 Construction of typical batteries used in marine environments is outlined
4 Apply principles of electromagnetism to EMF generation
  • 4.1 Form and properties of the magnetic fields surrounding single conductor and multi-turn solenoid coils when carrying an electrical current are compared and contrasted
  • 4.2 Terms and symbols used in Faraday’s and Lenz’s laws of electromagnetic induction are used correctly
  • 4.3 Calculations are performed using Faraday’s and Lenz’s laws of electromagnetic induction to solve problems related to electromagnetism and EMF generation
  • 4.4 Fleming’s Right Hand Rule is outlined
5 Explain operation of direct current rotating machinery
  • 5.1 Construction and methods of maintaining and repairing typical direct current (DC) machines are illustrated
  • 5.2 Principle wiring arrangements used with DC machines are outlined
  • 5.3 Action of the commutator in DC generators is outlined
  • 5.4 Significance of Back EMF (Eb) in the operation of DC motors is outlined
  • 5.5 Mathematical formula are applied to show relationships between operational parameters of DC motors
  • 5.6 Calculations are performed to solve simple problems relating to power output and efficiency in DC motors
6 Explain operation of AC rotating machinery
  • 6.1 How three-phase AC may be developed out of simple single phase AC is explained
  • 6.2 Difference between Star and Delta connections is outlined
  • 6.3 How a three-phase supply can generate a rotating magnetic field is explained
  • 6.4 Construction of an AC synchronous generator is outlined
  • 6.5 Construction of an AC induction motor is outlined
  • 6.6 Calculations are performed to show how driving torque is produced in an induction motor
7 Explain parallel operation and load sharing of generator
  • 7.1 Load/voltage curves of AC and DC generators are compared
  • 7.2 Main requirements for satisfactory power sharing between both AC and DC generators are outlined
  • 7.3 Sequences that occur when load changes on two DC generators working in parallel without an equaliser connection are outlined
  • 7.4 Effect of varying power factors on the load/voltage curve of an AC generator is outlined
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Replaces
State Code National Code Title Type
WG459 MARL5001A Apply basic principles of marine electrotechnology Unit of competency
Replaced By
State Code National Code Title Type
OCH23 MARL042 Apply basic principles of marine electrotechnology Unit of competency
State Code National Code Title Type
AVQ1 MAR50115 Diploma of Maritime Operations (Engineer Watchkeeper) Qualification