Written for marine and electrical engineers, this book provides up-to-date information on ships' electrical systems to support the knowledge requirements of . Second Edition ISBN 1 Practical Marine Electrical Knowledge . General Elechical Maintenance. Fault Finding. Page. 1. 1. 3. 4. 9. L0. 1L. Practical marine electrical knowledge / Dennis T. Hall Hall, Dennis T. View online ; Borrow · download 3 editions of this work. Find a specific edition.
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Download Best Book Practical Marine Electrical Knowledge, Download Practical Marine Electrical Knowledge 3rd, Edition Intended for marine and . Downloads, ebk eBooks, Hall Engineering Practical Marine Electrical Knowledge (ebook).EBK eBook Practical Marine Electrical Knowledge (3rd ed.). Practical Marine Electrical Knowledge 05 - Reed's Ship Construction For Marine Students (5th Edition ).pdf Chapter 3 Low Expansion Foam Systems.
Shore Supply Connection. Circuit Protection. Electric Cables.
AC Generator Operation. Generator Construction and Cooling. Excitation Methods. Automatic Voltage Regulation. Generators in Parallel. Emergency Generators. Generator Protection. Generator Maintenance. Main Switchboard.
Main Circuit Breakers. Chapter Four - Motors and Starters.
Motor Construction. Enclosures and Ratings. Induction Motor Operation. Control Equipment.
Reduced Voltage Starting. Speed Control.
Motor Protection. Single Phase Motors. Chapter Five - Ancillary Electrical Services. Incandescent Lamps.
Discharge Lamps. Voltage Effects on Lighting. Navigation and Signal Lights. Emergency Lighting. Maintenance of Lighting Fittings. Refrigeration and Air Conditioning. Galley and Laundry. Cathodic Protection.
Battery Supplies. Tanker Classification.
Hazardous Zones. Electrical Ignition of Gas. Apparatus Gas Groups. Temperature Class. Types of Explosion Protection. Exd Flameproof Enclosure. Exi Intrinsic Safety. Exe Increased Safety. Exn Non-Sparking. Exp Pressurised Apparatus. Exm Encapsulation. Exs Special Protection. Certification and Identification. Electrical Testing in Hazardous Areas.
The field is therefore zero at all places inside the body. The principles of electrostatics are important when designing items of high-voltage equipment. There is a finite limit to the electric field strength that may be withstood by any medium. Beyond this point, electrical breakdown occurs and an electric arc causes flashover between the charged parts. This principle is exploited in the lightning conductor , the sharp spike of which acts to encourage the lightning stroke to develop there, rather than to the building it serves to protect  Electric potential See also: Voltage and Battery electricity A pair of AA cells.
The concept of electric potential is closely linked to that of the electric field. A small charge placed within an electric field experiences a force, and to have brought that charge to that point against the force requires work.
The electric potential at any point is defined as the energy required to bring a unit test charge from an infinite distance slowly to that point.
It is usually measured in volts , and one volt is the potential for which one joule of work must be expended to bring a charge of one coulomb from infinity.
An electric field has the special property that it is conservative , which means that the path taken by the test charge is irrelevant: all paths between two specified points expend the same energy, and thus a unique value for potential difference may be stated. For practical purposes, it is useful to define a common reference point to which potentials may be expressed and compared.
While this could be at infinity, a much more useful reference is the Earth itself, which is assumed to be at the same potential everywhere. This reference point naturally takes the name earth or ground. Earth is assumed to be an infinite source of equal amounts of positive and negative charge, and is therefore electrically uncharged—and unchargeable.
It may be viewed as analogous to height : just as a released object will fall through a difference in heights caused by a gravitational field, so a charge will 'fall' across the voltage caused by an electric field. The equipotentials cross all lines of force at right angles. They must also lie parallel to a conductor 's surface, otherwise this would produce a force that will move the charge carriers to even the potential of the surface.
The electric field was formally defined as the force exerted per unit charge, but the concept of potential allows for a more useful and equivalent definition: the electric field is the local gradient of the electric potential. Moreover, the interaction seemed different from gravitational and electrostatic forces, the two forces of nature then known.
The force on the compass needle did not direct it to or away from the current-carrying wire, but acted at right angles to it. Faraday's homopolar motor consisted of a permanent magnet sitting in a pool of mercury. A current was allowed through a wire suspended from a pivot above the magnet and dipped into the mercury.
The magnet exerted a tangential force on the wire, making it circle around the magnet for as long as the current was maintained. Further analysis of this process, known as electromagnetic induction , enabled him to state the principle, now known as Faraday's law of induction , that the potential difference induced in a closed circuit is proportional to the rate of change of magnetic flux through the loop.
Exploitation of this discovery enabled him to invent the first electrical generator in , in which he converted the mechanical energy of a rotating copper disc to electrical energy. Electrochemistry Main article: Electrochemistry The ability of chemical reactions to produce electricity, and conversely the ability of electricity to drive chemical reactions has a wide array of uses.
Electrochemistry has always been an important part of electricity. From the initial invention of the Voltaic pile, electrochemical cells have evolved into the many different types of batteries, electroplating and electrolysis cells. Aluminium is produced in vast quantities this way, and many portable devices are electrically powered using rechargeable cells. Electric circuits Main article: Electric circuit A basic electric circuit.
The voltage source V on the left drives a current I around the circuit, delivering electrical energy into the resistor R. From the resistor, the current returns to the source, completing the circuit. An electric circuit is an interconnection of electric components such that electric charge is made to flow along a closed path a circuit , usually to perform some useful task.
The components in an electric circuit can take many forms, which can include elements such as resistors , capacitors , switches , transformers and electronics.
Marine Electrical -Dennis.T.hall
Electronic circuits contain active components , usually semiconductors , and typically exhibit non-linear behaviour, requiring complex analysis. The simplest electric components are those that are termed passive and linear : while they may temporarily store energy, they contain no sources of it, and exhibit linear responses to stimuli. The resistance is a consequence of the motion of charge through a conductor: in metals, for example, resistance is primarily due to collisions between electrons and ions.
Ohm's law is a basic law of circuit theory , stating that the current passing through a resistance is directly proportional to the potential difference across it.
The resistance of most materials is relatively constant over a range of temperatures and currents; materials under these conditions are known as 'ohmic'.
It consists of two conducting plates separated by a thin insulating dielectric layer; in practice, thin metal foils are coiled together, increasing the surface area per unit volume and therefore the capacitance. The unit of capacitance is the farad , named after Michael Faraday , and given the symbol F: one farad is the capacitance that develops a potential difference of one volt when it stores a charge of one coulomb.
A capacitor connected to a voltage supply initially causes a current as it accumulates charge; this current will however decay in time as the capacitor fills, eventually falling to zero.
Practical Marine Electrical Knowledge
A capacitor will therefore not permit a steady state current, but instead blocks it. When the current changes, the magnetic field does too, inducing a voltage between the ends of the conductor. The induced voltage is proportional to the time rate of change of the current. The constant of proportionality is termed the inductance.The chapters have the same titles as eight electrical training videos within a series also entitled Practical Marine Electrical Knowledge.
The unit of inductance is the henry , named after Joseph Henry , a contemporary of Faraday. Electric Cables. Attempts are made to include some of these resources in this edition. Covering the fundamentals, operating principles and safe working practices of most electrical systems and automation found on board ships, the book examines appliances, their circuits and explains common troubleshooting practices for faults.
Electric current can flow through some things, electrical conductors , but will not flow through an electrical insulator. The system must be tested at regular intervals to confirm that it does operate correctly.
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