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01-Electric current
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02-Consumption and production of electric energie
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03-Transformers and power transmission
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04-Domestic electricity and its dangers
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05-Sources and aspects of light
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06-Electromagnetic waves
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07-optical systems
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08-Lasers
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09-Vibratory nature of sound
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10-The humain Ear as a Sound Decteton
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11-Acoustic energy an physiological qualities
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12-Musical instruments Laws of vibrating strings and and sound pipes
human-ear-structure-working-sound-physics-khan-academy-1080-publer.io.mp4
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