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 Electrical Current 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 Electrical Current 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 Electrical Current https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:electrical-current/v/intro-to-current-amperes-pk 2025-12-18T00:30:56.558401705Z Intro to current (& Amperes) Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Intro to current (& Amperes) Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/GPfbLxIfoRQ.mp4/GPfbLxIfoRQ.mp4 526 Electrical Current https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:electrical-current/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/electrical-engineering/introduction-to-ee/intro-to-ee/v/ee-conventional-current 2021-03-01T15:43:22Z Conventional current direction By convention, we define positive direction of current to be in the direction a positive charge would move. Electrons (with their negative charge) move in the opposite direction of the positive current arrow. Willy McAllister video https://cdn.kastatic.org/googleusercontent/RJZR6EMNXcW989aiJHaPEkR9DYc5_yDdFwoGN_SJ766mEkbO8NmABkctVYzs2OJ_Ir7jeDcFJrRtGjjGAEOkzxeh Conventional current direction By convention, we define positive direction of current to be in the direction a positive charge would move. Electrons (with their negative charge) move in the opposite direction of the positive current arrow. https://cdn.kastatic.org/ka-youtube-converted/17EhKw2tsu4.mp4/17EhKw2tsu4.mp4 237 Electrical Current https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:electrical-current/v/alternating-current-direct-current-what-is-frequency-pk 2025-12-18T00:50:41.122522621Z Alternating current, direct current & what is frequency? Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Alternating current, direct current & what is frequency? Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/241lQPvTOR0.mp4/241lQPvTOR0.mp4 773 Electrical Current https://www.khanacademy.org/science/electrical-engineering/introduction-to-ee/intro-to-ee/a/ee-voltage-and-current 2025-03-12T14:22:11.706219694Z Basic electrical quantities: current, voltage, power Build an intuitive understanding of current and voltage, and power. article https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:electrical-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