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.
Here is an overview if the fastest planes in the World and their Top Speed (Click enlarge). Additional Reading: 1  Read about the SR-71 Blackbird mentioned in the article here. 2  The XB-70 Valkyrie (also mentioned in the article). 3  The worldâs fastest (rocket-) aircraft, the experimental X-15.