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.
However, the first recognized flight exceeding the speed of sound for the first time by a manned aircraft in controlled level flight was on October 14, 1947 in an American research project, using the experimental Bell X-1 research rocket plane, piloted by Charles Chuck Yeager.