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In physics, power is defined as the rate at which work is done. In other words, it measures how quickly energy is being transferred or transformed. Explore the concept of power in physics through an example of two weightlifters, one who lifts faster than the other, to see that power measures the rate at which work is done. Finally, learn how to calculate both average and instantaneous power.
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Physicists define work as the amount of energy transferred by a force. Learn about the formula for calculating work, and how this relates to the work-energy principle, which states that the net work done on an object is equal to the change in its kinetic energy.
Review the concepts and formulas of current, resistance, and resistivity in DC circuits with Khan Academy's interactive exercises and videos.
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.
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High school physics—NGSS (DEPRECATED) Course: High school physics—NGSS (DEPRECATED) > Unit 1. Lesson 1: Force, mass, and acceleration. Newton's first law of motion introduction. Applying Newton's first law of motion. Newton's second law of motion. More on Newton's second law.
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Watch this video to learn how to calculate the capacitance of a capacitor, a device that stores electric charge and energy in a circuit.