• 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.

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