自感現象演示器主要用于演示電感在電路中通電及斷電時產生的現象。電感在通電及斷電時，由于繞組本身的電流變化而在繞組內部產生電磁感應現象，自感現象中產生的感應電動勢要阻礙電流的變化，使得電流延遲或變大。本演示器自感現象的變化用燈泡來表示。通電時，與電感串聯的燈泡要比與電位器串聯的燈泡遲亮；斷電時，回路中的燈泡突然變亮。
J2446 The Phenomenon of Self-Presentatio
It is used for the main demonstration in the inductor circuit in electricity and power generated. Inductance in the power and electricity, due to the current changes in the winding itself in winding Internal produce electromagnetic induction, resulting in the phenomenon of self induction of force to impede the current changes in current or delay big. This phenomenon of self-presentation of the changes come to light bulbs. Electricity, and light bulbs than the inductance tandem with the potential series of light bulbs later; power, the loop of a sudden change light bulbs.