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.
It is called Mach 1. Mach numbers are given to fast airplane speeds rather than miles per hour. They indicate the ratio of the speed of sound to the speed of the plane. Mach 2 is twice, and Mach 3 is three times the speed of sound. Through ordinary air, the speed of sound is about one mile in five seconds, but it varies with temperature. < Prev.