Instruction of disabled men in motion picture projection, an elementary text book (1919)

Page scan 00050 from Instruction of disabled men in motion picture projection, an elementary text book

Record Details:

Title:
Instruction of disabled men in motion picture projection, an elementary text book
Date:
1919
Publisher:
New York, The Red cross institute for crippled and disabled men
Volume:
Instruction of disabled men in motion picture projection, an elementary text book
Leaf #:
00050
Language:
English
Subjects:
Motion picture projection, People with disabilities -- Rehabilitation
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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MOTION PICTURE PROJECTION 35 Resistance consumes pressure. To find the resistance offered by a copper wire, multiply its length in feet by 10.5 and divide the product by the area of wire in circular mils. Ohms Law. Ohms law is merely the fundamental principal 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 circuit has a resistance of 5 ohms, then by di- viding 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 = Current For instance suppose we have a line voltage of 100 and are using 20 amperes at arc lamp, then by di- viding 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.