电喇叭工作时,在间断电流的作用下,电喇叭的振动触点易产生电弧,烧伤触点,使电喇叭不能正常工作。消除电弧的方法有以下三种:①触点两端并联电容器。由于瞬时电压的作用,电容器易击穿。②并联电阻。由于电阻能让电流通过.对触点的正常开闭有一定的影响。⑤用一电阻和电容器串联,再和触点两端并联。这样,既不影响触点开闭,又不易击穿电容器。 Electric horn work, under the action of the intermittent current, electric horn vibration contact easy to produce arc, burns contact, so that the electric horn can not work properly. There are three ways to eliminate the arc: ① contacts at both ends of the capacitor in parallel. Due to the instantaneous voltage, the capacitor breaks down easily. ② parallel resistance. As the resistance allows current to pass through, there is a certain effect on the normal opening and closing of contacts. ⑤ with a resistor and capacitor in series, and then both ends of the contacts in parallel. In this way, does not affect the contact opening and closing, but also not easy breakdown capacitor.