Film: 378

Education | 1940 | Sound | B/W

Synopsis:

Electrical repairs in the home. Good for 1940's décor in house. Designed primarily as an educational tool to market new electrical appliances. Good use of technology no longer in use, i.e. 3amp plug.
Opening shots: family in living room having breakfast. Mother brings old fashioned electrical toaster to table. Plugs in toaster to light fitting / attachment in ceiling. Shots of mother attaching toaster socket to light fitting (close up). Fuse in plug shorts. Small burst of flame. Mother and daughter look up. Close up of socket and wire burned. Father explains to children what a blown fuse means. Mother suggests her daughter helps her mend fuse. Father suggests that his son helps him fix the lamp holder. Mother and daughter go to fuse box and turn off electricity supply. Close up of old meter, where the current comes through the main switch, through the fuse box up the wall, across the light switch into the lamp. The circuit is completed when the current returns through the main switch and meter to the mains. Close up diagram of switch which controls the flow of current. Dotted line used to show flow of electricity. Shot of electrical fuse box and meter. Mother explains the function of the electrical meter. Detailed close up of the mother reading the meter. Close up of meter card. Close up of mother showing her daughter the fuse box. Shot of four fuses. Voice-over used to explain how the electrical circuits in the house work. Diagram showing conducting bridge between the two contacts. Shot of insulated knob which controls bridge. When the switch is pressed down the circuit is made (shown on diagram). Move the switch up and contact is broken switching the lamp off. The whole procedure is then shown again with the full diagram. Wires in house are made to carry a limited amount of electricity. The fuse is placed there to make sure too much current does not flow. Shot of current passing through a very thin wire (diagram). This fuse wire, like other fuse wires can only carry a limited amount of current. If two wires touch holder, a short circuit occurs caused by an extra large flow of current. The fuse wire cannot carry it, it becomes very hot and melts. This stops the current. Repeated close up of lamp holder socket. The flex has worn away the insulation and left the wires in contact and exposed. Mother and daughter locate fuse. Close up of fuse wire which has melted. Mother demonstrates the repair of a melted fuse. Close up of fuse wire showing variety of fuses for different purposes. 5-amp, 10-amp and 15-amp (lighting, heating and power). Mother explains that the appropriate wire to be used is the 5-amp ,and removes the broken discs. Shown in close up. Daughter removes length of wire, cuts it with scissors and winds ends around the terminal. Daughter rewinds wire around terminal clockwise after failed first attempt. Close up of daughter fixing the fuse. Mother replaces the new fuse back in fuse box. Father explains how to fit a new plug to the toaster. Close up of father trimming off the wires to make them even and bare. Each individual strand is twisted tight. Father dismantles plug by unscrewing nuts and removing insulated strip. Earth is fitted to the top terminal. Father replaces insulated strip which is screwed down tight. Washers replaced, nuts put back on and screwed down. Top of plug replaced ready for use in wall socket. Close up of three-pin plug now attached to the toaster being put into wall socket. Close ups of young girl putting on the main switch (Crabtree make) being turned on light switch being pushed. Light coming on. Good close up of old fashioned toaster.


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