description About
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.
Info
- verified Status: Released
- calendar_month Release Date: 1931-04-30
- video_camera_front Companies
- timer Runtime: 11 Mins
- star Rating: 2 / 10
- favorite Likes: 1 Likes
- info IMDB ID
- visibilityViews: 1 views
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