Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances (1918)
Keene, E. S. (Edward Spencer), b. 1864 · New York, McGraw-Hill book company, inc.; · leaf 360
partlybroken away to expose the interior construction. The wiresfrom house mains MM lead the current to the primary coil Pwhich is a large number of turns of fine wire wound about a soft-iron core. The induced current in the secondary coil S is takenfrom the contact points 1, 2, 3 and 4. The… … Fig. 250.—Doorbell trans-former. Fig. 251.—Details of doorbelltransformer. in the coil permits only enough current to flow as will keep thecore excited. This is a step-down transformer and the secondarycoil contains fewer turns of wire than the primary coil. Sincethe voltage induced in the…
Heating · Lighting · Plumbing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-694-399.webp)
