Motion picture projection : an elementary text book (1928)

Page scan 00087 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 #:
00087
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 81 creased there will be a proportional increase in current. Expressed mathematically „ , Electric Motive Force Current = Resistance Current is equal to the Electric Motive Force (Voltage) divided by the Resistance (in ohms) or E C = — R If by dividing the voltage by the resistance we get the amount of current, then by dividng the voltage by the current we will naturally get the amount of resistance in our circuit, or — EMF R = and so to find the voltage all we have to do it to multiply the current by the amount of resistance in our circuit, or — EMF = C X R It will thus be seen that provided we have two known quantities the third unknown quantity can easily be obtained by the use of one of the above formulas; for instance, let us suppose that we have a line voltage of 100 and our circuit has a total resistance of 5 ohms, then by dividing the 100 (volts) by 5 (ohms) we find our current to be 20 (amperes). Provided we knew there was a line voltage of 100 and we were drawing 20 amps at our arc, then