https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:electric-circuits/x0e2f5a2c:current-resistivity-ohms-law/v/electric_current 2024-05-14T13:21:48.153833747Z Electric current Electric current is the net rate that charge flows through a cross-sectional area. Current is measured in amperes (A), equivalent to coulombs per second (C/s). Current flows when there is an electric potential difference (voltage) between two points, and there are charge carriers that are free to move between those points. Electrical conductors (metals) contain electrons that are free to move. Electrons are the drifting particles in a current-carrying wire, but conventional current is defined as the direction that positive charge would flow. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/c378c0d0-d325-46f8-89e6-2bf7a9b6cb55_1280_720_base.png Electric current Electric current is the net rate that charge flows through a cross-sectional area. Current is measured in amperes (A), equivalent to coulombs per second (C/s). Current flows when there is an electric potential difference (voltage) between two points, and there are charge carriers that are free to move between those points. Electrical conductors (metals) contain electrons that are free to move. Electrons are the drifting particles in a current-carrying wire, but conventional current is defined as the direction that positive charge would flow. https://cdn.kastatic.org/ka-youtube-converted/6K1Bl0cqecE.mp4/6K1Bl0cqecE.mp4 809 Current and voltage https://www.khanacademy.org/science/electrical-engineering/introduction-to-ee/intro-to-ee/v/ee-current 2024-05-29T15:36:53.180294047Z Electric current Current is the flow of charge. Copper and silver atoms have loose electrons, making them good conductors. Current is measured by counting charges passing through a boundary per second. It also shows how saltwater conducts current with positive and negative ions moving in opposite directions. Willy McAllister video https://cdn.kastatic.org/googleusercontent/qReGk1pYET53gG33yqvBHpXz40SDQ2gz07dCd4feqpvqSxt9gOvLAkjc7ywEyq6U_ACaNlq2dRokYV0cgiQ3kU4 Electric current Current is the flow of charge. Copper and silver atoms have loose electrons, making them good conductors. Current is measured by counting charges passing through a boundary per second. It also shows how saltwater conducts current with positive and negative ions moving in opposite directions. https://cdn.kastatic.org/ka-youtube-converted/ZRLXDiiUv8Q.mp4/ZRLXDiiUv8Q.mp4 558 Current and voltage https://www.khanacademy.org/science/electrical-engineering/introduction-to-ee/intro-to-ee/v/current-direction 2021-03-01T15:43:22Z Current direction The positive sign for current corresponds to the direction a positive charge would move. In metal wires, current is carried by negatively charged electrons, so the positive current arrow points in the opposite direction the electrons move. This has been the sign convention for 270 years, ever since Ben Franklin named electric charges with + and - signs. This convention came about 150 years before the discovery of the electron. Willy McAllister video https://cdn.kastatic.org/googleusercontent/pKZQJAkTSo5fr2PM-2cKnt-lHDjyD9BlyWOld1ihADi7kqq3DhJg4W-VHQUVhEEBno8B2_-Dbx03Kv2GpQgMlE0 Current direction The positive sign for current corresponds to the direction a positive charge would move. In metal wires, current is carried by negatively charged electrons, so the positive current arrow points in the opposite direction the electrons move. This has been the sign convention for 270 years, ever since Ben Franklin named electric charges with + and - signs. This convention came about 150 years before the discovery of the electron. https://cdn.kastatic.org/ka-youtube-converted/4frpZ4Q0q58.mp4/4frpZ4Q0q58.mp4 328 Current and voltage https://www.khanacademy.org/science/in-in-class10th-physics/in-in-electricity/in-in-electric-current-circuit/e/finding-electric-current 2026-03-25T20:00:51.494577527Z Finding electric current Let's practice problems involving the relationship between current and flowing charges. Satrajit exercise https://www.khanacademy.org/science/grade-10-physics-snc-aligned/x502b86fa259f0088:electrical-current/x502b86fa259f0088:potential-difference-and-emf/v/intro-to-potential-difference-voltage-ur 2025-08-08T00:50:08.705567982Z Intro to potential difference & voltage Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Intro to potential difference & voltage Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/_Pul5lYfnEs.mp4/_Pul5lYfnEs.mp4 788 Current and voltage https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:electric-circuits/x0e2f5a2c:current-resistivity-ohms-law/v/what_is_voltage 2026-04-16T15:20:38.862861542Z Voltage (electric potential difference) The electric potential at a point represents the electric potential energy per unit charge that a particle would have at that location. The difference in electric potential between two points is called voltage. It's measured in volts (V), equivalent to joules per coulomb (J/C). When comparing two points, the point with the higher electric potential is labelled positive (+), and the point with the lower electric potential is negative (-). If two points are at the same electric potential, the voltage between them is zero. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/d5c4aa26-c7b6-4d1b-81e5-315e5bcb7aa7_1280_720_base.png Voltage (electric potential difference) The electric potential at a point represents the electric potential energy per unit charge that a particle would have at that location. The difference in electric potential between two points is called voltage. It's measured in volts (V), equivalent to joules per coulomb (J/C). When comparing two points, the point with the higher electric potential is labelled positive (+), and the point with the lower electric potential is negative (-). If two points are at the same electric potential, the voltage between them is zero. https://cdn.kastatic.org/ka-youtube-converted/NT6LYNq3jRE.mp4/NT6LYNq3jRE.mp4 767 Current and voltage https://www.khanacademy.org/science/bridge-course-class-10th-science/x37589313f9a4c197:week-5/x37589313f9a4c197:voltage-and-current/e/apply-voltage-and-current 2026-03-26T05:20:35.16058035Z Apply: voltage and current Apply your knowledge of voltage and current in this set of free practice questions. Emily Cizmas exercise