Khoa học tự nhiên lớp 9 - Bài 11: Điện trở - Định luật Ohm - Kết nối tri thức

Natural Science Grade 9 - Connecting Knowledge - Lesson 11: Resistance - Ohm's Law - Teacher Nguyen Chi Son Facebook:   / nguyenchhison   Website: http://thaynguyenchison.vn/ Summary of lesson content: Resistance is a quantity that characterizes the effect of hindering the flow of electric current in the circuit. The current intensity running through a wire is proportional to the voltage applied to the two ends of the wire The graph showing the dependence of the current intensity on the voltage is a straight line passing through the origin Ohm's law: The current intensity running through a wire is proportional to the voltage between the two ends of the wire and inversely proportional to its resistance The resistance of a wire is proportional to the length of the wire, inversely proportional to the cross-section of the wire and depends on the nature of the material used to make the wire Video content includes: 00:00 - (1) Resistance 02:23 - (2) The dependence of the current intensity on the voltage 07:46 - (3) Ohm's law 12:47 - (4) The resistance of a wire depends on the size and nature of the wire