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Este libro es un conjunto de problemas resueltos del área de la ingeniería eléctrica, fruto de la larga experiencia acumulada por los autores en la docencia de la asignatura Electrotecnia en la ETSEIAT de la UPC. Trata de los circuitos eléctricos trifásicos, especialmente como circuitos de potencia, cuya metodología y comportamiento en régimen sinusoidal es imprescindible conocer para entender la generación, el transporte y la distribución de la energía eléctrica (capítulo 1). Presenta una colección de problemas de transformadores monofásicos, orientados a la determinación de los parámetros del circuito equivalente a través de las pruebas de vacío y cortocircuito, así como a la determinación del rendimiento (capítulo 2). Asimismo, se presenta el trabajo de transformadores en paralelo. También se estudia el comportamiento de los transformadores trifásicos en régimen sinusoidal alimentando diferentes tipos de cargas (capítulo 3). Se dedica un capítulo a la resolución de problemas de máquinas asíncronas, especialmente a los motores trifásicos, ampliamente utilizados en la industria, pues el estudio de sus circuitos equivalentes, previa determinación de sus parámetros, es fundamental para la determinación del funcionamiento del motor (capítulo 4). Asimismo, se estudia la potencia del motor en distintas situaciones, así como el rendimiento del mismo y el proceso de arranque. Se hace referencia a los distintos ejercicios de máquinas síncronas, donde la máquina se estudia como generador y motor (capítulo 5). Varios de los problemas que se presentan en esta obra fueron ejercicios de examen en las diferentes convocatorias. Finalmente, se incluye un compendio de exámenes realizados en los últimos años (capítulo 6).