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Learn about the concept of power in physics, including how to calculate average and instantaneous power.
Current is the rate of flow of charge, and voltage measures the energy transferred per unit of charge. We can insert these definitions into the equation for power: power = d U d t = d U d q ⋅ d q d t = v i. Electrical power is the product of voltage times current. in units of watts.
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.
Lesson 1: Electric current & circuit. Intro to charge. Unit of charge (Coulombs) Intro to current (& Amperes) Finding electric current.
Let's practice some problems to better understand the concept of electric power and its relation with voltage and current in a circuit.
Review the key terms, equations, and skills related to current, resistance, and resistivity, including how to find the current direction and what resistance depends on.
Math: Pre-K - 8th grade; Pre-K through grade 2 (Khan Kids) Early math review; 2nd grade; 3rd grade; 4th grade; 5th grade; 6th grade; 7th grade; 8th grade; 3rd grade math (Illustrative Math-aligned)
Course: Electrical engineering > Unit 5. Lesson 1: Electric force and electric field. Coulomb's law. Electric force. Inverse square law. Electric field.
Preparing to study electrical engineering on Khan Academy. Basic electrical quantities: current, voltage, power. Numbers in electrical engineering. Defining the standard electrical units.