Kunshan ammeter manufacturers introduce the development history of ammeter

William Edward Weber has made many contributions to electromagnetism. For his research, he invented many electromagnetic instruments. In 1841, a double line ammeter was invented, which can measure both geomagnetic intensity and current intensity; In 1846, an electric power meter was invented, which can be used not only to determine the electrodynamics unit of current intensity, but also to measure AC power; In 1853, the geomagnetic sensor for measuring the vertical component of geomagnetic intensity was invented. Weber has made great achievements in establishing the measurement of electrical units. He proposed the unit and measurement method of current intensity, electric quantity and electromotive force; According to the electrodynamic formula of ampere, the electrodynamic unit of current intensity is proposed; The unit of resistance is also proposed. Weber and collausch worked together to determine the ratio of electromagnetic unit to electrostatic unit of electric quantity, and found that the ratio was equal to 3 × 10 ^ 8m / s, close to the speed of light.