Electrical Engineering Practice: A Practical Treatise for Electrical, Civil, and Mechanical Engineers ...J. Wiley & Sons, Incorporated, 1924 - Electric engineering |
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Page 9
... Voltmeter , indicating V. Galvanometer Gal . Voltmeter , recording RV . Wattmeter , indicating W. Overload relay , constant time limit . • • OR / CT . Wattmeter , recording ᎡᎳ . Overload relay , inverse time Ampere - hour meter AH ...
... Voltmeter , indicating V. Galvanometer Gal . Voltmeter , recording RV . Wattmeter , indicating W. Overload relay , constant time limit . • • OR / CT . Wattmeter , recording ᎡᎳ . Overload relay , inverse time Ampere - hour meter AH ...
Page 20
... voltmeter . Low Pressure means a pressure in a system normally not exceeding 250 V where the electrical energy is used . Medium Pressure means a pressure in a system normally above 250 V , but not exceeding 650 V , where the electrical ...
... voltmeter . Low Pressure means a pressure in a system normally not exceeding 250 V where the electrical energy is used . Medium Pressure means a pressure in a system normally above 250 V , but not exceeding 650 V , where the electrical ...
Page 22
... voltmeters connected between line and earth at different points , just as a pressure gauge would show different readings at various points along a horizontal water pipe discharg- ing under an imposed pressure . In both cases , the ...
... voltmeters connected between line and earth at different points , just as a pressure gauge would show different readings at various points along a horizontal water pipe discharg- ing under an imposed pressure . In both cases , the ...
Page 24
... voltmeter currents , telegraphy , and electro- medical work this term ( or the still smaller micro - ampere = one- millionth ampere ) is generally used . Leakage currents in a domestic installation are generally of this order , as shown ...
... voltmeter currents , telegraphy , and electro- medical work this term ( or the still smaller micro - ampere = one- millionth ampere ) is generally used . Leakage currents in a domestic installation are generally of this order , as shown ...
Page 28
... circuit ( § 298 ) . Thus if the pressure is said to be 220 V -i.e. the virtual or root - mean - square pressure as shown by a § correctly calibrated voltmeter - then the maximum value will 28 § 31 ELECTRICAL ENGINEERING PRACTICE.
... circuit ( § 298 ) . Thus if the pressure is said to be 220 V -i.e. the virtual or root - mean - square pressure as shown by a § correctly calibrated voltmeter - then the maximum value will 28 § 31 ELECTRICAL ENGINEERING PRACTICE.
Common terms and phrases
3-phase alternating current aluminium ammeter ampere-hours amperes apparatus applied armature average boiler bus bars cables capacity Chapter charge circuit breaker coal coil condenser conductor connected constant consumption contacts copper cost current flowing curve cusecs cycles diameter dielectric strength dynamo earth eddy currents effect efficiency electrical electrostatic energy engines factor of safety feeder field frequency fuel full-load fuse heat higher increase induction installation instrument insulation iron lagging latter load factor loss machine magnetic maximum demand measured mechanical metal meter motor Ohm's Law operating output overhead lines phase pipe plant pole power factor practice pressure reactance reduced relay resistance rubber short-circuit shunt speed station steam steel supply switch Table temperature transformers transmission turbine units utilised varies velocity voltage voltmeter vulcanised watt-hour meter wattless wattmeter wave winding wire
Popular passages
Page 4 - As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere...
Page 4 - Ampere, which is one-tenth of the unit of current of the CGS system of electromagnetic units and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Page 4 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Page 18 - C, if the metal is in the form of a 1 cm. -cube, but since the resistance of a conductor is directly proportional to its length and inversely proportional to its cross-sectional area, it is 1'6 x 100 x 100 = 16 000 microhms = 0 '016 n if the 1 cu.
Page 5 - ... the Institution of Electrical Engineers has framed to secure satisfactory results with a supply of electrical energy at low pressures, not exceeding 250...
Page 31 - N. -seeking pole of a magnetic needle, as viewed from the conductor, is towards the left of the current. For certain particular cases in which a...
Page 469 - A. 18 of the regulations for securing the safety of the public, made by the Board of Trade under the Electric Lighting Acts, 1882 to 1909.
Page 217 - ... 25. Adequate working space and means of access, free from danger, shall be provided for all apparatus that has to be worked or attended to by any person.
Page 212 - For this reason sensitiveness is more correctly defined as the ratio of the difference between the maximum and minimum equilibrium speeds to the mean equilibrium speed.
Page 23 - and the like. Such ideas are survivals from the days before a scientific system of units had been evolved and co-ordinated in Ohm's Law (§ 17). From what has been written above it will be seen that the strength of current in a circuit, in amperes, depends on the other two factors of resistance and pressure. By Ohm's Law, if the standard pressure of a supply is (say) 220...