Download American Electricians' Handbook by Terrell Croft, Clifford C. Carr PDF

By Terrell Croft, Clifford C. Carr

This bestselling reference has been the undisputed commonplace in its box considering the fact that 1913. each portion of the guide has been completely up to date with such very important revisions as up-to-date codes, advances in good country expertise, new details on cars, and lately constructed instruments, gear, and different items on hand from brands.

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These two methods of plotting such curves are shown in Figs. 36. 116. The word phase, which is used in ac terminology, refers basically to time. When two alternating currents are in phase, they reach their corresponding zero, maximum, and intermediate values at exactly the same instants. Two in-phase ac quantities are shown in Fig. 38. If currents or voltages are not in phase, they reach corresponding values at different instants of time, as shown in Fig. 39. com) Copyright © 2004 The McGraw-Hill Companies.

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3. By changing the strength of the magnetic field linked with a conductor. If in Fig. 9 an alternating electric current is passed through winding A, it will set up a magnetic field through the iron ring. This magnetic field will be continually changing in strength, owing to the changing magnitude of the current. There will therefore be a continual change in the magnetic flux linked with winding B. This change will generate a voltage between the two ends of winding B. It is this phenomenon that makes possible the operation of transformers (see Div.

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