Maxwell's Equations and Electromagnetic Waves I

 Fundamentals of Physics, II (PHYS 201) Waves on a string are reviewed and the general solution to the wave equation is described. Maxwell's equations in their final form are written down and then considered in free space, away from charges and currents. It is shown how to verify that a given set of fields obeys Maxwell's equations by considering them on infinitesimal cubes and loops. A simple form of the solutions is assumed and the parameters therein fitted using Maxwell's equations. The wave equation follows, along with the wave speed equal to that of light (3 x 10^8), suggesting (correctly) that light is an electromagnetic wave. The vector relationship between the electric field, the magnetic field and the direction of wave propagation is described. 00:00 - Chapter 1. Background 04:43 - Chapter 2. Review of Wave Equation 20:01 - Chapter 3. Maxwell's Equations 56:47 - Chapter 4. Light as an Electromagnetic Wave Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses

9. Magnetism II

 Fundamentals of Physics, II (PHYS 201) The mechanism by which electric currents produce a magnetic field (Law of Biot-Savart) is discussed in greater detail. The field due to a single loop and an infinite wire are computed. Ampere's Law is derived. The operation of the DC electric motor is used to illustrate the torque generated on moving charges in a magnetic field. 00:00 - Chapter 1. Review of Magnetic Fields 14:00 - Chapter 2. Torque on Charge moving in Magnetic Field 20:56 - Chapter 3. Magnetic effects produced by electric currents 51:26 - Chapter 4. Ampere's Law Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses

11. Lenz's and Faraday's Laws

Fundamentals of Physics, II (PHYS 201) The electric effect of a changing magnetic field is described using Faraday's Law. The direction of the current so generated is given by Lenz's Law. The operation and energy accounting of the generator are described. The concept of inductance is introduced. The Betatron is described as an example of Faraday's Law. Self and mutual inductance are introduced. The energy density in a magnetic field is derived. 00:00 - Chapter 1. Review of Lenz and Faraday's Law 25:37 - Chapter 2. The power generator 37:45 - Chapter 3. Mutual and self inductance 64:10 - Chapter 4. Energy density of a magnetic field Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses This course was recorded in Spring 2010.

Monitoreo de subestacion electrica

Las Armónicas (3)

Las Armónicas (2)

4/5 Ejemplos sobre Calidad Eléctrica en la Industria

En este video se presentan algunos ejemplos de varias ramas de la industria en donde se resuelven de manera satisfactoria los posibles problemas existentes en torno a la Calidad de la Energía Eléctrica (Power Quality).

3/5 Soluciones y Consejos sobre Calidad Eléctrica

Casi el 80% de los problemas de energía eléctrica en una empresa están relacionados con una mala calidad de la energía. Desconocer o menospreciar el impacto de una mala calidad de la energía eléctrica es sus instalaciones trae consecuencias negativas.

PERUANA ES LA PRIMERA LATINA que se gradúa en INGENIERIA AEROESPACIAL

Rosa Ávalos, de 23 años, se convirtió en la primera latina, en Estados Unidos, que se gradúa en la carrera de ingeniería aeroespacial. La joven, natural de Chilca, se ganó una de las cuatro becas que sorteaba la cadena televisiva Univisión en Norteamérica y así pudo estudiar en la universidad Virginia Tech. ‘Rosita’, como la llaman sus familiares, dio un discurso en la ceremonia de graduación en la que participó Michelle Obama, esposa del presidente de ese país. En una semana viajará al Kennedy Space Center, de la NASA, para comenzar a trabajar.

Feira de ciências nos EUA premia trabalhos de estudantes brasileiros