Ohm's law | Physics | Khan Academy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now. https://www.khanacademy.org/science/ap-physics-2 Through experiment, we can uncover the relationship between the current through a circuit element and the voltage across it. Measurements show that the current is equal to the voltage divided by the element’s resistance (I=ΔV/R). This relationship is called Ohm’s law. Since the current is proportional to the voltage, a graph of current through an element versus the voltage across it is a straight line. The slope of the line is the element’s conductance, which is the reciprocal of resistance. Though many circuit elements obey Ohm’s law, some do not. Such components are called non-ohmic. Sections: 00:00 - Intro 00:27 - Experimental setup 03:05 - Plotting voltage vs. current 05:56 - Ohm's law 08:50 - Calculating resistor value 11:29 - Ohmic and non-ohmic devices ------------------ Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc