Applied Electronics: A First Course in Electronics, Electron by Truman S. Gray

By Truman S. Gray

A uncomplicated textual content overlaying the actual phenomena concerned about digital conduction; ways that those phenomena mix to control the features, scores, and barriers of digital units; and purposes of electronics to some of the branches of electric engineering.

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Extra info for Applied Electronics: A First Course in Electronics, Electron Tubes, and Associated Circuits (Principles of Electrical Engineering series)

Example text

The resulting electric field in the tube exerts a force on the electrons " and causes them to move toward the anode, thereby setting up an 8 "Standards on Electron Tubes : Definitions of Terms, 1950," I. E. , 38 (1950),433. ELEMENTS OF ELECTRON-TUBE OPERATION Art. 2] 7 electric current in the interelectrode space. A simple circuit involving such a tube is shown in Fig. 1 . In the external circuit, the electrons flow from the anode through the voltage source to the cathode ; by convention, the electric current is in the opposite direction.

Nalogy, consider that an infinitesimal region separates the two equipotential surfaces indicated in Fig. 6. Let the potential of surface 1 be El and the potential of surface 2 be E 2 ; and let the datum of the potentials be the point where an electron that passes through point P on surface 1 had zero velocity. When this electron reaches point P, its speed is = [77 ] If the angle between the path of the electron at P and the normal to 17 R. P. Johnson, "Simple Electron Microscopes," J. App. Phys .

36 agrees with Eq. 30 and might, in fact, have been obtained directly from that equation. Furthermore, the derivation of Eq. 30 is more general than that of Eq. 36 because it does not involve the assumption that the el e ctric field is uniform. " = J-2 2eb, . m [38] and the kinetic energy of the particle as it r e aches the plate is tmvl)2 = -Qeb, [ 39] which is the decrease in the potential energy of the particle that occurs as the particle moves across the tube. Thus, the increase of kinetic energy of the particle equals the decrease of po t enti al energy and, in accordance with the principle of conservation of energy, the total energy of the particle is constant.

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