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By the end of this section, you will be able to: 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.
- 20.4: 20.4 Electric Power and Energy
Electric power (P P) is simply the product of current times...
- 20.4: 20.4 Electric Power and Energy
We can define electrical energy as the energy generated by the movement of electrons from one point to another. The movement of charged particles along/through a medium (say wire) constitute current or electricity. Electrical Energy Formula. A cell has two terminals – a negative and a positive terminal.
15 Ιουν 2022 · Equation. The equation for electrical energy is given by the following: E = P x t. Where. E : Energy transferred in kWh (1 kWh = 3.6 x 10 6 J) P : Power of the appliance in kW (1 kW = 1000 W) t : Amount of time in hours that the appliance operates ( 1 h = 3600 s)
25 Μαΐ 2024 · Stewart. Last updated. 25 May 2024. Energy & Power. In mechanics, power P is defined as the rate of doing work. The potential difference is the work done per unit charge. Current is the rate of flow of charge. Therefore, the electrical power is defined as the rate of change of work done:
So electrical energy (the work done) is obtained by multiplying power by the time in seconds that the charge (in the form of a current) flows. Thus units of electrical energy depend on the units used for electric power and time.
Electric power (P P) is simply the product of current times voltage. Power has familiar units of watts. Since the SI unit for potential energy (PE) is the joule, power has units of joules per second, or watts. Thus, 1A ⋅ V = 1W 1 A ⋅ V = 1 W.
For example, when a current flows in a conductor, electrical energy is converted into thermal energy within the conductor. The electrical field, supplied by the voltage source, accelerates the free electrons, increasing their kinetic energy for a short time.
