Current is measured in Amperes (usually just referred to as âAmpsâ). An ampere is defined as 6.241*10 18 electrons (1 Coulomb) per second passing through a point in a circuit. Amps are represented in equations by the letter âIâ.
The X-1, piloted by Chuck Yeager, was the first manned airplane to exceed the speed of sound in level flight and was the first of the X-planes, a series of American experimental rocket planes (and non-rocket planes) designated for testing of new technologies and often kept secret.
The SR-71 Blackbird.mashleymorgan / Flickr. The world's fastest manned planes are nothing short of engineering marvels. Capable of flitting through the air at multiple times the speed of sound, these planes take the pilot to the fringe of science fiction. Although a number of these aircraft have since been retired, they continue to be the fastest manned aircraft in history.