La guerra de Secesión se avecina (Civil War Is Coming)

Técnico electricista 14 – Curso visual y gráfico Protecciones eléctricas y tableros En esta clase analizaremos los principios de funcionamiento de los fusibles, las formas constructivas, y la operación de los interruptores termomagnéticos y diferenciales. Caracterizaremos los contactores, y explicaremos la construcción y clasificación de los tableros, veremos cómo se componen y los materiales utilizados para su construcción. Explicaremos los grados de protección IP relacionados con los tableros y mencionaremos los diversos accesorios que pueden utilizarse en tableros domiciliarios.

In the United States, the ability to take informed action is becoming increasingly necessary, and difficult. This book delves into the importance of being informed and explains how not all sources of information are equal. Readers are introduced to the scientific method as a way of testing information for credibility. Students will also learn how to turn credible information into action by forming groups, protesting, contacting elected representatives, and possibly even running for office themselves someday.

Two books in one, this oversized volume shows readers the plants, root systems, insects, fossils, animals, mines, gems, minerals, and man-made wonders such as tunnels, subways, submarines, pipes, cables, and power lines that can be found underground or underwater in an unforgettable visual way. Each page takes you deeper and deeper under the waves or through layers of earth.

Know Your NumbersFind the hidden numbers in these exciting counting books. Count by ones, twos, fives, and tens!