The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 185
of theelectrons in moving to the anode. This expenditure of energycauses the heating of the anode. The true d-c. resistance of the tube is, of course, given simplyby the ratio of the total amount of work done to the square of the current, i.e., by y^. The a-c. resistance on the other hand, is given… … given by the reciprocal of the slope of the straight line OC, while theimpedance of the tube is given by the ratio of the alternatingvoltage ep between filament and plate to the alternating currentip in the plate circuit. Now, the flow of electrons in the tubeshows no lag, and for frequencies low…
Telegraph, Wireless
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