https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:electric-circuits/x0e2f5a2c:circuits-oms-kirchhoffs-laws/v/electric-circuits-part-1 2026-06-14T15:20:38.731319356Z Intro to electric circuits Electric circuits are paths through which electric current can flow. Circuits are composed of specific building blocks known as circuit elements. Circuit elements include batteries and other voltage sources, wires, resistors, light bulbs and LEDs, and switches. Ammeters and voltmeters can be used to measure current and voltage in a circuit, respectively. An open circuit contains a broken path, preventing current flow. A short circuit contains a path with negligible resistance, resulting in very high current. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/69deb774-2257-4c09-8f24-246ac585e3a5_1280_720_base.png Intro to electric circuits Electric circuits are paths through which electric current can flow. Circuits are composed of specific building blocks known as circuit elements. Circuit elements include batteries and other voltage sources, wires, resistors, light bulbs and LEDs, and switches. Ammeters and voltmeters can be used to measure current and voltage in a circuit, respectively. An open circuit contains a broken path, preventing current flow. A short circuit contains a path with negligible resistance, resulting in very high current. https://cdn.kastatic.org/ka-youtube-converted/Nbb5Lw14wvo.mp4/Nbb5Lw14wvo.mp4 718 Electric circuits https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:electric-circuits/x0e2f5a2c:circuits-oms-kirchhoffs-laws/v/electric-circuits-part-2 2026-06-14T15:20:38.731319356Z Series and parallel circuits Circuit elements can be connected in series or in parallel. A series connection exists when elements are joined along a single chain. The same current flows through every element in the chain. A parallel connection exists when elements are connected across the same two points in a circuit, with no other components between them. The same voltage exists across each element in a parallel connection. Real-world circuits often utilize a combination of both series and parallel connections. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/605cc969-d321-45ea-b107-17be8fc8e9c1_1280_720_base.png Series and parallel circuits Circuit elements can be connected in series or in parallel. A series connection exists when elements are joined along a single chain. The same current flows through every element in the chain. A parallel connection exists when elements are connected across the same two points in a circuit, with no other components between them. The same voltage exists across each element in a parallel connection. Real-world circuits often utilize a combination of both series and parallel connections. https://cdn.kastatic.org/ka-youtube-converted/1ASc6piVKhQ.mp4/1ASc6piVKhQ.mp4 852 Electric circuits https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:electric-circuits/x0e2f5a2c:circuits-oms-kirchhoffs-laws/v/ohms-law 2026-06-09T12:40:46.120135017Z Ohm's law 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. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/0fd79a2e-d95b-4e14-a160-3f041bbf0a1e_1280_720_base.png Ohm's law 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. https://cdn.kastatic.org/ka-youtube-converted/FuIn1L3qeqI.mp4/FuIn1L3qeqI.mp4 738 Electric circuits https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:electric-circuits/x0e2f5a2c:circuits-oms-kirchhoffs-laws/e/apply-electric-circuits-and-ohm-s-law 2026-06-29T18:00:57.756067884Z Apply: Electric circuits and Ohm's law Apply your understanding of electric circuits and Ohm's law in this set of free, standards-aligned practice questions. Emily Cizmas exercise