• ETT Level 2.7: General

    Understand simple AC and DC equipment and basic testing procedures.

    1. Simple ac and dc equipment - Identify the functions and components of common types of electrical motors, generators, transformers, solenoids and contactors. Be familiar with their uses in single phase, three-phase or dc systems.
      • Electric motors An electric motor is an electrical machine that converts electrical energy into mechanical energy.
      • Electric generators An electric generator is a device that converts mechanical energy to electrical energy for use in an external circuit.
      • Transformers A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
      • Solenoids Electromechanical solenoids consist of an electromagnetically inductive coil, wound around a movable steel or iron slug (termed the armature).
      • Contactors A contactor is an electrically controlled switch used for switching an electrical power circuit, similar to a relay except with higher current ratings. A contactor is controlled by a circuit which has a much lower power level than the switched circuit.
    2. Basic testing procedures - Recognize and understand basic requirements for the evaluation and assessment of electrical apparatus.

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