Before the invention of transistors vacuum tubes played a main role in electronics. Vacuum tubes are also called as electronic tubes or valves. Vacuum tube consists of an anode and the cathode. These anode and cathode are placed in a tightly closed glass tube in which vacuum is filled. The cathode is heated by a filament which helps the cathode to emit the electrons
Sat essay word length The shortest essays (around 100 words) received the lowest possible score, 1 (or a combined score of 2 out of while the longest essays (around 400 words), received the highest score, a 6 (or a combined score of 12 out of
English Grammar solution: Structure of All Tense, Structure of the Tense. i would probably break this chart down into different pieces but most kids have trouble when it comes to the different tenses. so this would help a lot in the classroom.