• ETT Level 2.15: Direct-Current Systems

    Learn how to recognize and understand the use and application of batteries, generators and rectifiers.

    1. Basic devices and sources - Recognize and understand the use and application of batteries, generators and rectifiers.
      • Series and Parallel Battery Configurations Battery banks achieve the desired operating voltage by connecting several cells in series; each cell adds its voltage to the total terminal voltage. Parallel connection attains higher capacity for increased current handling; each cell adds to the ampere-hour (Ah) count.
      • UPS Basics [PDF] An uninterruptible power system (UPS) is the central component of any well designed power protection architecture.
      • UPS Wiki The primary role of any UPS is to provide short-term power when the input power source fails. However, most UPS units are also capable in varying degrees of correcting common utility power problems.
      • Generator Wiki In electricity generation, a generator is a device that converts mechanical energy to electrical energy for use in an external circuit.
      • Emergency power system An emergency power system is an independent source of electrical power that supports important electrical systems on loss of normal power supply. A standby power system may include a standby generator, batteries and other apparatus. Emergency power systems are installed to protect life and property from the consequences of loss of primary electric power supply.
      • Diodes and Rectifiers: Rectifier circuits Simply defined, rectification is the conversion of alternating current (AC) to direct current (DC). This involves a device that only allows one-way flow of electrons.
      • 4 Battery Hazards and How to Avoid Them Performing regular inspections on battery systems presents a unique challenge from other electrical power systems in that you cannot simply turn them off for maintenance or corrective action.

    External links are provided by our community of test technicians. Please submit any resources that you feel may be helpful to this topic.


    Recommended: Study tips for the NETA exam

    Share this page

Search TestGuy
   Tag Cloud   Advanced Search
Follow us


Explore TestGuy


NETA Certification Training


Help and Support