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-2Through 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
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