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 Potential Difference and emf https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:potential-difference-and-emf/v/voltage 2023-09-10T17:11:17.624018169Z Voltage Explore the distinction between electric potential energy and electric potential, often confused terms in electrostatics. Understand how electric potential, or voltage, is associated with position, while electric potential energy is tied to a charge. Reinforce your understanding of these concepts through examples involving charged plates and electric fields. Sal Khan video https://cdn.kastatic.org/googleusercontent/RyZEvkvM5d9Ghz5AFBk6BW4xP-fwrqVpSr7bPn8mlmS-Q2dPW95iniVEo7joSQWgWYw9-eKBKoorr2359nww0mMx Voltage Explore the distinction between electric potential energy and electric potential, often confused terms in electrostatics. Understand how electric potential, or voltage, is associated with position, while electric potential energy is tied to a charge. Reinforce your understanding of these concepts through examples involving charged plates and electric fields. https://cdn.kastatic.org/ka-youtube-converted/zqGvUbvVQXg.mp4/zqGvUbvVQXg.mp4 535 Potential Difference and emf https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:potential-difference-and-emf/a/electric-potential 2021-05-25T21:59:58Z Electric potential article https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793: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 Potential Difference and emf https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:potential-difference-and-emf/v/cells-emf-terminal-voltage-internal-resistance-pk 2025-12-18T00:50:41.122522621Z Cells, EMF, terminal voltage & internal resistance Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Cells, EMF, terminal voltage & internal resistance Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/4wXelWEddj0.mp4/4wXelWEddj0.mp4 870 Potential Difference and emf https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:potential-difference-and-emf/e/cells-emf-and-internal-resistance 2026-04-07T23:17:37.123726494Z Cells: emf and internal resistance Let's practice some problems to better understand how the internal resistance of a cell influences the terminal voltage and the current that can be drawn from it. Satrajit exercise https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:potential-difference-and-emf/v/solved-example-potential-difference-work-done-pk 2025-12-18T00:50:41.122522621Z Solved example: Potential difference & work done Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Solved example: Potential difference & work done Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/Irz5i7rkpQ8.mp4/Irz5i7rkpQ8.mp4 306 Potential Difference and emf https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:potential-difference-and-emf/e/voltage-and-work 2021-04-29T07:59:25Z Voltage and work Let's practice problems involving the work done in moving charges through a potential difference. Satrajit exercise https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:electric-circuits/x0e2f5a2c:compound-circuits/v/voltmeters-and-ammeters 2024-06-22T03:37:04.709004473Z Voltmeters and ammeters Learn how to measure voltage and current in electrical circuits using voltmeters and ammeters. Discover why voltmeters are connected in parallel and ammeters in series. Understand the importance of resistance in these devices to ensure accurate readings and prevent damage. David SantoPietro video https://cdn.kastatic.org/googleusercontent/RFBykNlABlr2tENaoQBr3L9Eh9EuiW3K-dUoXgd5oNzSi3hDZDxi89R1EBg4IcbzcZo2P7wGGikgHXkN5c212El7zw Voltmeters and ammeters Learn how to measure voltage and current in electrical circuits using voltmeters and ammeters. Discover why voltmeters are connected in parallel and ammeters in series. Understand the importance of resistance in these devices to ensure accurate readings and prevent damage. https://cdn.kastatic.org/ka-youtube-converted/yE3eQ6q39f4.mp4/yE3eQ6q39f4.mp4 498 Potential Difference and emf https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:potential-difference-and-emf/e/dc-voltmeters-and-ammeters-ap1 2026-04-07T23:36:17.218592739Z Using voltmeters and ammeters to measure potential difference and current Practice identifying the correct placement of voltmeters and ammeters to measure an unknown circuit or electric potential difference for a circuit.  April Russell exercise https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:potential-difference-and-emf/a/dc-voltmeters-and-ammeters-ap1 2021-04-29T08:01:27Z DC Ammeters and voltmeters review Review the key terms and skills related to voltmeters and ammeters, including where to place them in a circuit. article https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:potential-difference-and-emf/v/cells-in-series-pk 2025-12-18T00:50:41.122522621Z Cells in series Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Cells in series Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/hsuEtAs1b6E.mp4/hsuEtAs1b6E.mp4 521 Potential Difference and emf https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:potential-difference-and-emf/v/cells-connected-in-parallel-pk 2025-12-18T00:50:41.122522621Z Cells connected in parallel Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Cells connected in parallel Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/bavPjnaXXCA.mp4/bavPjnaXXCA.mp4 466 Potential Difference and emf https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electrical-quantities/x0e04e0cb682fb793:potential-difference-and-emf/e/cells-in-series-and-parallel 2026-04-08T01:15:04.085520103Z Cells in series and parallel Let's practice some problems to get better at solving circuits with multiple cells in series or parallel combinations. Satrajit exercise