Motion picture projection : an elementary text book (1928)

Page scan 00053 from Motion picture projection : an elementary text book

Record Details:

Title:
Motion picture projection : an elementary text book
Date:
1928
Publisher:
New York : Technical Book Company
Volume:
Motion picture projection : an elementary text book
Leaf #:
00053
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Date Added:
May 08, 2025
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MOTION PICTURE PROJECTION 47 electrical power in mechanical power, divide the number of watts by 746. Ohms Law. Ohms law is merely the fundamental principle on which most of electrical mathematics are worked. A series of formulas used by electricians in figuring voltage, amperage and resistance: Formula 1 To find the amount of current flowing in a circuit divide the voltage by the resistance, or Electric Motive Force Current = Resistance For instance, if we have a line voltage of 100 and our circut has a resistance of 5 ohms, then by dividing 100 by 5, we would get our amperage. 5 ) 100 ( 20 100 so we would have 20 amperes. Formula 2 To find the amount of resistance in a circuit, divide the voltage by the amount of amperage drawn, or Electric Motive Force Resistance = 1 Current For instance, suppose we have a line voltage of 100 and are using 20 amperes at arc lamp, then by dividing the 100 by 20 we would get the amount of resistance we have in our circuit. 20 ) 100 ( 5 100 so we would have 5 ohms resistance in our circuit. Formula 3 To find the voltage of a circuit, multiply the amount of amperes drawn by the amount of resistance, or