Elements describe the essential outcomes. | Performance criteria describe the performance needed to demonstrate achievement of the element. |

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 Ohmâ€™s Law to electrical circuits | 2.1 | Main sources of EMF are identified |

2.2 | Terms and symbols used in Ohmâ€™s Law are used correctly |

2.3 | Calculations are performed using Ohmâ€™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 Faradayâ€™s and Lenzâ€™s laws of electromagnetic induction are used correctly |

4.3 | Calculations are performed using Faradayâ€™s and Lenzâ€™s laws of electromagnetic induction to solve problems related to electromagnetism and EMF generation |

4.4 | Flemingâ€™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 |