The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!
From the Wiki University
What evidence can you provide to prove your understanding of each of the following citeria?
Explain how material properties affect resistance of electrical conductors
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Terms and symbols used in the formula for resistivity are used correctly Completed |
Evidence:
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How resistance varies with changes in conductor length and cross sectional area is outlined Completed |
Evidence:
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How resistance varies with temperature is outlined Completed |
Evidence:
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Calculations are performed that illustrate how material properties affect resistance of electrical conductors Completed |
Evidence:
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Apply Ohm’s Law to electrical circuits
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Main sources of EMF are identified Completed |
Evidence:
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Terms and symbols used in Ohm’s Law are used correctly Completed |
Evidence:
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Calculations are performed using Ohm’s Law to solve problems involving internal, external and variable resistances in both series and parallel circuits Completed |
Evidence:
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Calculations are performed to determine power required and /or energy expended by electrical devices Completed |
Evidence:
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Circuits for a wheatstone bridge and a slide wire bridge are sketched and their application on a ship is outlined Completed |
Evidence:
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Calculations are performed dealing with resistances, currents and voltage drops in bridge circuits under null or balanced conditions Completed |
Evidence:
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Apply principles of electrolytic action to electrical cells
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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 Completed |
Evidence:
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Primary cells are distinguished from secondary cells Completed |
Evidence:
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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 Completed |
Evidence:
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How capacity of a battery is measured is explained Completed |
Evidence:
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Construction of typical batteries used in marine environments is outlined Completed |
Evidence:
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Apply principles of electromagnetism to EMF generation
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Form and properties of the magnetic fields surrounding single conductor and multi-turn solenoid coils when carrying an electrical current are compared and contrasted Completed |
Evidence:
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Terms and symbols used in Faraday’s and Lenz’s laws of electromagnetic induction are used correctly Completed |
Evidence:
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Calculations are performed using Faraday’s and Lenz’s laws of electromagnetic induction to solve problems related to electromagnetism and EMF generation Completed |
Evidence:
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Fleming’s Right Hand Rule is outlined Completed |
Evidence:
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Explain operation of direct current rotating machinery
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Construction and methods of maintaining and repairing typical direct current (DC) machines are illustrated Completed |
Evidence:
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Principle wiring arrangements used with DC machines are outlined Completed |
Evidence:
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Action of the commutator in DC generators is outlined Completed |
Evidence:
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Significance of Back EMF (Eb) in the operation of DC motors is outlined Completed |
Evidence:
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Mathematical formula are applied to show relationships between operational parameters of DC motors Completed |
Evidence:
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Calculations are performed to solve simple problems relating to power output and efficiency in DC motors Completed |
Evidence:
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Explain operation of AC rotating machinery
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How three-phase AC may be developed out of simple single phase AC is explained Completed |
Evidence:
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Difference between Star and Delta connections is outlined Completed |
Evidence:
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How a three-phase supply can generate a rotating magnetic field is explained Completed |
Evidence:
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Construction of an AC synchronous generator is outlined Completed |
Evidence:
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Construction of an AC induction motor is outlined Completed |
Evidence:
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Calculations are performed to show how driving torque is produced in an induction motor Completed |
Evidence:
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Explain parallel operation and load sharing of generator
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Load/voltage curves of AC and DC generators are compared Completed |
Evidence:
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Main requirements for satisfactory power sharing between both AC and DC generators are outlined Completed |
Evidence:
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Sequences that occur when load changes on two DC generators working in parallel without an equaliser connection are outlined Completed |
Evidence:
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Effect of varying power factors on the load/voltage curve of an AC generator is outlined Completed |
Evidence:
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