Voltage | Introduction to electrical engineering | Electrical engineering | Khan Academy

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The positive sign for current corresponds to the direction a positive charge would move. In metal wires, current is carried by negatively charged electrons. The positive current arrow points opposite the direction the electrons move. This has been the sign convention for 270 years, ever since Ben Franklin name electric charges with + and - signs, 150 years before the discovery of the electron.

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Electrical engineering on Khan Academy: A summary of the math and science preparation that will help you have the best experience with electrical engineering taught on Khan Academy. Become familiar with engineering numbers and notation, and learn about the two most important electrical quantities: current and voltage.

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