HD
1931
فيلم Electrical Telegraphy, Electric Bells and Telephones 1931 مترجم اون لاين
Movie · 11 د · رسوم متحركة · ★ 2.0
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.
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