Electrical Fundamentals; Direct Current |
Common terms and phrases
50 VOLTS ammeter ampere-hour amperes amperes per second AMPS atom bar magnet battery voltage cemf change of current closed-circuit voltage coil conductor connected in parallel connected in series copper current flows decrease dry cell effective resistance electric field electrolyte electromagnet energy equal equation example flux density free electrons hydrogen hydrometer increase indicates induced emf induced voltage inductors internal resistance ions Kirchhoff's lead peroxide lead sulphate lead-acid battery lines of force load loop magnetic field magnetic force magnetomotive force meter method moving mutual inductance negative charge negative plate negative terminal number of turns Ohm's law Ohm's law formula ohms parallel circuit polarity positive charge positive plate positive terminal potential difference R₁ rate of change resistor secondary cell series circuit shown in figure solenoid solution specific gravity spongy lead sulphuric acid switch test charge total inductance velocity voltage drop voltmeter watts wire zinc
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Page 25 - Every particle of matter, in the universe, attracts every other particle with a force, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Page 98 - The total current in a parallel circuit is equal to the sum of the currents in the individual branches.
Page 20 - The smallest particle of stone which could be obtained by this process would be a molecule. Actually, it is impossible to crush a stone into its molecules; we can only crush it into dust. One small particle of dust is composed of thousands of molecules. d. Atom. An atom is defined as the smallest part of an element that can take part in ordinary chemical changes. The atoms of a particular element are of the same average mass, but their average mass differs from that of the atoms of all other elements....
Page 88 - Specific gravity is the ratio of the weight of a given volume of material at 73.4°F (23°C) to that of an equal volume of water at the same temperature.
Page 98 - In a parallel circuit, the total current is equal to the sum of the currents in the individual branches.
Page 100 - The total resistance of a parallel circuit is equal to the reciprocal of the sum of the reciprocals of the individual resistances of the circuit.
Page ii - OFFICIAL: WM. E. BERGIN Major General, USA The Adjutant General J. LAWTON COLLINS Chief of Staff, United States Army OFFICIAL: KE THIEBAUD Colonel, USAF Air Adjutant General HOYT S.
Page 93 - ... drop of potential from A to B. Apparently, whether there is a potential rise or fall between two points depends entirely on our point of view. For example, in Figure 5-4, view B, it is equally correct to say that there is a voltage rise from B to A as it is to say there is a voltage fall from A to B. In practical work, as previously mentioned, our interest usually is centered on voltages and currents in operating circuits. A voltmeter always indicates the potential difference between the two...
Page 86 - The specific gravity of a gas may be defined as the ratio of the weight of a given volume of gas to the weight of an equal volume of air measured at the same temperature and pressure. The specific gravity of a dry gas referred to dry air is, for all practical purposes, the same for any temperature.
Page 52 - R where v is the voltage in volts, / is the current in amperes, and R is the resistance in ohms. The...