Without a multimeter, how do you determine the positive and negative terminals of a capacitor?
1. Do not distinguish between the polarity of the capacitor
Our most common CBB capacitors, ceramic capacitors, polyester capacitors are not polarity distinction, the use of polarity does not need to pay attention to.
2. Distinguish the polarity of the capacitor
Solid state capacitors. Solid capacitors can be distinguished according to the capacitor shell marked, shell marked with black is negative, or capacitor pin short is negative.
Aluminium electrolytic capacitors. In the capacitor shell will be marked "-" symbol, marked on the side of the negative pole.
Tantalum electrolytic capacitors. In the capacitor shell shell has a dark colour painted edge of the side is positive.
Capacitors as an important component of the circuit is used with attention, according to different characteristics of the correct choice of capacitance parameters. And the positive and negative poles of the distinction is generally these methods.
AC capacitors are not divided into positive and negative polarity, such as single-phase motor start capacitors, washing machine start capacitors, electric fan start capacitors, energy-saving lamps damping capacitors, etc. are AC capacitors, is not divided into positive and negative polarity, commonly used code is ACxx microfarad, do not have to distinguish between positive and negative polarity, TV, Dv, recorders, energy-saving lamps AC rectified DC voltage output DC capacitors are used, often labeled DCx × microfarad marked live! General negative shell are marked with a "one of the standard, this negative corresponds to the negative end of the capacitor, the other foot is positive, do not need a multimeter at a glance to see the understanding.
Directly look at the appearance can be, then tell you how to look.
Capacitor is divided into polar capacitance and non-polar capacitance, non-polar capacitance is not divided into positive and negative poles, and only polar capacitance to distinguish between positive and negative poles.
