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If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.
Formal definitions of the standard electrical units: ampere, coulomb, charge on an electron, and the volt. Written by Willy McAllister.
Math: Get ready courses; Get ready for 3rd grade; Get ready for 4th grade; Get ready for 5th grade; Get ready for 6th grade; Get ready for 7th grade; Get ready for 8th grade
In this video David derives the formula to find the power used by a resistor. Skip to main content If you're seeing this message, it means we're having trouble loading external resources on our website.
Learn the basics of electricity, such as electric charge, current, potential difference, power, and energy. Explore the concepts of Ohm's law, resistors, and circuits with Khan Academy.
We develop the concept of an electric field surrounding charges. We work through examples of the electric field near a line, and near a plane, and develop formal definitions of both *electric potential* and *voltage*.
Review the concepts and formulas of current, resistance, and resistivity in DC circuits with Khan Academy's interactive exercises and videos.
Two equal and opposite charges separated by some distance constitute a dipole. The product of the charge and distance between them is called the dipole moment. Dipole moment represents the strength of the dipole. The electric field generated by the dipole is proportional to the dipole moment.
Let's solve some problems to better understand the formula and unit of electric current and resistance.