## Principles of Electrical Engineering |

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abamperes abvolts air gap aluminum ampere-turns amperes applied armature Assume battery cable capacitance carrying a current cell charge circular mils coefficient coil computed condenser conductivity conductor connected constant copper wire core cross-section cubic centimeter current flowing curve decrease deflection diameter dielectric dielectric constant direction distance drop electric circuit electrolyte electromotive force electrons electrostatic energy engineer equal equation expression filament flux density flux lines formula galvanometer gausses heat hence hysteresis loss inductance insulation ionization ions iron lamp leakage length line integral linkages load loop magnetic circuit magnetic field magnetic flux magnetizing force magnetomotive force material measured metal meter mile molecules motor number of turns obtain Ohm's law ohms parallel pass path permeability plate pole potential gradient Prob produced proportional reluctance resistor self-inductance sheet shown in Fig solenoid square inch steel switch temperature total flux transformer transmission tube varies voltage volts watts zero

### Popular passages

Page 19 - Is known as the international ampere, which is one-tenth of the unit of current of the centimeter-gram-second system of electro-magnetic units, and is the practical equivalent of the unvarying current, which, when passed through a solution of nitrate of silver in water in accordance with standard specifications, deposits silver at the rate of one thousand one hundred and eighteen milllonths of a gram per second.

Page 76 - 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 518 - AN INITIAL FINE OF 25 CENTS WILL BE ASSESSED FOR FAILURE TO RETURN THIS BOOK ON THE DATE DUE. THE PENALTY WILL INCREASE TO SO CENTS ON THE FOURTH DAY AND TO fl.OO ON THE SEVENTH DAY OVERDUE.

Page 496 - Engineers, must be followed in placing interior conductors. (For insulated aluminum wire, the safe carrying capacity is 84 per cent of that given in the following tables for copper wire with the same kind of insulation...

Page 6 - For the purpose of economical distribution, a power plant should be located as near as possible to the center of the district it supplies.

Page 362 - If the Thumb, Forefinger, and Middle Finger of the Right Hand are held at right angles to one another, with the Thumb...

Page 380 - The pull on a conductor in a magnetic field is proportional to the strength of the current in that conductor and the strength of the magnetic field itself.

Page 147 - I^E/R where / is the current (in amperes), E is the electromotive force (in volts) and R is the resistance (in ohms).

Page 22 - ABC's of Radio, page 9, introduces with a. bit of background, viz: "Ohm early in the 19th century discovered that the ratio of the pressure to the current in a given circuit is constant. This is the fundamental law of the flow of electrical currents." Then follows the formula: "R = — where R = resistance in ohms IE = pressure in volts I = current in amperes.

Page 141 - Thus, by simply altering the swash control from a maximum in one direction to a maximum in the other, it is possible to vary the output speed of the gear from a maximum to a minimum.