Power refers to the amount of work done by an object in a unit of time, that is, power is a physical quantity that describes the speed of work. The amount of work is constant, and the shorter the time, the greater the power value. The formula for finding power is: power = work/time. Power is a physical quantity that characterizes the speed of work. The work done per unit time is called power, denoted by P.

Ultrasonic power

In the process of sound wave transmission, when the sound wave propagates to the originally static medium, the medium particle vibrates back and forth near the equilibrium position, resulting in compression and expansion in the medium. It can be considered that sound waves make the medium obtain vibrational kinetic energy and deformation potential energy. The sound energy obtained by the medium due to the sound wave disturbance is the sum of the kinetic energy of vibration and the potential energy of deformation.

The propagation of sound waves in the medium is accompanied by the propagation of energy. If we take a tiny volume element (dV) in the sound field, suppose the original volume of the medium is Vo, the pressure is po, and the density is ρ0. The kinetic energy of the volume element (dV) due to acoustic vibration △Ek; △Ek=(ρ0 Vo)u2 /2

△Ek is the kinetic energy, J; u is the particle velocity, m/s; ρ0 is the medium density, kg/m3; Vo is the original volume, m3.

An important feature of ultrasound is its power. Ultrawave has a much stronger power than ordinary sound waves. This is one of the important reasons why ultrasound can be widely used in many fields.

When ultrasonic waves reach a certain medium, the molecules of the medium vibrate due to the action of ultrasonic waves. Moreover, its vibration frequency is the same as that of ultrasonic waves. The frequency of the vibration of medium molecules determines the speed of vibration. The higher the frequency, the greater the speed. The energy obtained by the vibration of the medium molecules is not only related to the mass of the medium molecules, but also proportional to the square of the vibration speed of the medium molecules. Therefore, the higher the frequency of the ultrasound, the higher the energy obtained by the medium molecules. The frequency of ultrasonic waves is much higher than that of ordinary sound waves, so ultrasonic waves can make medium molecules get a lot of energy, while ordinary sound waves have little effect on medium molecules. In other words, the energy of ultrasonic waves is much greater than that of sound waves and can supply medium molecules with sufficient energy.