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Express electrical power in terms of the voltage and the current. Describe the power dissipated by a resistor in an electric circuit. Calculate the energy efficiency and cost effectiveness of appliances and equipment. In an electric circuit, electrical energy is continuously converted into other forms of energy.
Power is the amount of energy transferred or converted per unit time. In the International System of Units , the unit of power is the watt , equal to one joule per second. Power is a scalar quantity.
Review the units of work, energy, force, and distance. Use the equations for mechanical energy and work to show what is work and what is not. Make it clear why holding something off the ground or carrying something over a level surface is not work in the scientific sense.
Work, Energy and Power are fundamental concepts of Physics. Work is said to be done when a force (push or pull) applied to an object causes a displacement of the object. We define the capacity to do the work as energy. Power is the work done per unit of time.
In other words, Energy = power x time and Power = voltage x current. Therefore electrical power is related to energy and the unit given for electrical energy is the watt-seconds or joules. Electrical Energy = Power, (W) x Time, (s)
4 cze 2024 · The amount of energy transferred when an external force causes an object to move over a certain distance. If a constant force is applied parallel to the direction of the object's displacement, the work done can be calculated using the equation: W = Fs. Where: W = work done (J) F = average force applied (N) s = displacement (m)
Work, Energy, and Power. Lesson 1 - Basic Terminology and Concepts; Definition and Mathematics of Work; Calculating the Amount of Work Done by Forces; Potential Energy; Kinetic Energy; Mechanical Energy; Power; Lesson 2 - The Work-Energy Relationship; Internal vs. External Forces; Analysis of Situations Involving External Forces
