Rated: 2 out of 10 with 1 votes.
When copper wire is wrapped around an iron rod and connected to a battery, it becomes an electromagnet. A science teaching material movie that explains the principle and structure of electric bells and telephones by applying the principle of an electromagnet through a fusion of live action and animation..
2 PG-13 US
Show More Show Less Production: popularity :0.6
Release Date:
1931-04-30
runtime:
11
Keywords:
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