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Alan Turing's Automatic Computing EngineThe Master Codebreaker's Struggle to build the Modern Computer$
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B. Jack Copeland

Print publication date: 2005

Print ISBN-13: 9780198565932

Published to Oxford Scholarship Online: January 2008

DOI: 10.1093/acprof:oso/9780198565932.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 13 April 2021

How valves work

How valves work

(p.341) 17 How valves work
Alan Turing's Automatic Computing Engine

David O. Clayden

Oxford University Press

This chapter presents background information on valves. A valve consists of an evacuated glass envelope containing a number of electrodes. These are connected to the outside by wires passing though special seals. The innermost electrode is the cathode, which consists of a metal tube coated with a material that emits electrons when it is heated. In the simplest form of valve, called a diode, the cathode is surrounded by a metal cylinder called the anode. If the anode is connected to a voltage that is positive relative to the cathode, the anode attracts electrons from the cathode and a current flows. Valves as amplifiers and switches, power consumption, and valve specifications are described.

Keywords:   valves, cathode, anode, amplifiers, switches, power consumption

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