BASIC DC THEORY EXAM

This exam will test your level of comprehension of the basic DC theory section of the electrical training course.     … [Read more...]

BASIC DC THEORY 21

<previous  BASIC DC THEORYBASIC DC THEORY EXAM  click here DC MOTOR OPERATION DC motors require special starting resistors for operation due to their unique design. A knowledge of the operation of these starting resistors is necessary to understand DC motor operation.          <previous  BASIC DC THEORYBASIC DC THEORY EXAM  click here … [Read more...]

BASIC DC THEORY 20

<previous  BASIC DC THEORY 20 next> TYPES OF DC MOTORS There are various types of DC motors found in industry today. Each type contains various characteristics that makes it desirable for certain applications.           <previous  BASIC DC THEORY 20 next> … [Read more...]

BASIC DC THEORY 19

 <previous  BASIC DC THEORY 19 next> DC MOTOR THEORY DC motors are widely used to drive various equipment. The speed and torque produced in a DC motor depends on a variety of factors.         <previous  BASIC DC THEORY 19 next> … [Read more...]

BASIC DC THEORY 18

<previous  BASIC DC THEORY 18 next> DC GENERATOR CONSTRUCTION A DC generator may be constructed in a variety of ways depending upon the relationship and location of each of the fields. Each type of construction contains certain advantages.                   <previous  BASIC DC THEORY 18 … [Read more...]

BASIC DC THEORY 17

<previous  BASIC DC THEORY 17 next> DC GENERATOR THEORY DC generators are widely used to produce a DC voltage. The amount of voltage produced depends on a variety of factors.                 <previous  BASIC DC THEORY 17 next> … [Read more...]

BASIC DC THEORY 16

<previous  BASIC DC THEORY 16 next> DC EQUIPMENT CONSTRUCTION Direct current machines are energy transfer devices. These machines can function as either a motor or a generator. DC motors and generators have the same basic construction, differing primarily in the energy conversion. To better understand the operation and construction of DC machines, a few basic terms must … [Read more...]

BASIC DC THEORY 15

<previous  BASIC DC THEORY 15   next> DC EQUIPMENT TERMINOLOGY Direct current devices are used frequently in today’s technology. Before the construction and operation of these devices can be introduced, a few common terms must be understood.   Terminal Voltage Terminal voltage, as applied to DC generators, is defined as the voltage that can be measured at the output of the … [Read more...]

BASIC DC THEORY 14

 <previous  BASIC DC THEORY 14   next> BATTERY HAZARDS Because batteries store large amounts of energy, there are certain hazards that are associated with battery operation. These hazards must be fully understood to ensure safe operation of batteries.   Shorted Cell Cell short circuits can be caused by several conditions, which include the following: faulty separators; lead … [Read more...]

BASIC DC THEORY 13

<previous  BASIC DC THEORY 13   next> TYPES OF BATTERIES The lead-acid battery is the most common type of battery in use today. There are other types of storage batteries, each having certain advantages.     Wet and Dry Cells Wet and dry cells are classified by the type of electrolyte the battery uses. The electrolyte of a cell may be a liquid or a paste. If the … [Read more...]

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