U.S. Navy Wwii Era Radio Technician Training Film - Capacitance Ohms Law 47514 (1943)

Synopsis

Produced by Burton Holmes Films during WWII, this black & white educational film is about Capacitance, the ability of a system to store an electric charge. It was made to educate U.S. Navy Radio Technicians and was probably standard viewing during training. Typical of government films made during the WWII timeframe, this film is outstanding in its use of both live action and animated sequences. Copyright is 1943. Opening titles: United States Navy Training Film - Capacitance (:06-:32). Two uniformed men play pool. A narrator explains the flow of current. Animation shows a current flow. Resistor is explained. A pool table. Ball is hit by a pool cue. Pool balls on the table. A resistor and a circuit are explained. Movement of electrons shown with animation between A and B. A is negative and B is positive (2:16-4:04). More energy being stored with larger plates is shown via animation. A man uses a capacitor. A hand unscrews a cap holding air in a tire. Air tank gauges. When valve is opened, air rushes out (4:05-6:01). A man connects a power supply and charges a condenser. Voltage is increased. Q is quantity of electricity stored. Plate spacing. The plate area (6:02-8:09). The dielectric is an insulating material or a very poor conductor of electric current. When dielectrics are placed in an electric field, practically no current flows in them because, unlike metals, they have no loosely bound, or free, electrons that may drift through the material. Glass is used as a…

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Details

Running time

25 minutes

Collection

Ephemeral Films

Subjects on the Internet Archive

• Stock Footage