The arrow always points to the negative lead.
Normally all electrolytic capacitors negative lead is marked on the side and if the plastic cover came off and it is new the long lead is the positive.
Difrence is between lead positions. Axial one is -[]- and Radial =[] Axial ones are mutch pricier, but they are good choice for poin to point construction and low profile pcb's.
The positive leg is usually indicated with a red dot. Sometimes there is an white arrow that looks like a minus sign - that is the negative terminal. If it is a can type, the can is the minus terminal and the tab(s) is(are) the plus terminal(s).
The distance between the leads (lead spacing) on a radial capacitor
Yes. A capacitor stores charge from any source, including AC.The difference between DC and AC, however, is that the capacitor will be constantly changing in charge, in step with the AC. Due to the nature of the capacitor, the current through the capacitor will lead the voltage by some amount, depending on capacitance and resistance. {In the ideal case of a perfect capacitor, conductors, and AC power source, the current will lead the voltage by 90 degrees phase angle.}This is called capacitive reactance.Another way for a capacitor to store charge from an AC source, of course, is to place a rectifier diode in front of the capacitor. This, then, becomes an AC to DC converter.
Normally all electrolytic capacitors negative lead is marked on the side and if the plastic cover came off and it is new the long lead is the positive.
Difrence is between lead positions. Axial one is -[]- and Radial =[] Axial ones are mutch pricier, but they are good choice for poin to point construction and low profile pcb's.
See web site http://www.stsi.biz/eeu-fc0j272l.html The short lead is the negative side.
The positive leg is usually indicated with a red dot. Sometimes there is an white arrow that looks like a minus sign - that is the negative terminal. If it is a can type, the can is the minus terminal and the tab(s) is(are) the plus terminal(s).
Capacitive reactance is -1 / (2 pi f C), so the reactance of a 330 µf capacitor at 60 hz is -8 ohms. (The negative sign simply means that the current will lead the voltage.) However, an electrolytic capacitor is not designed for operation on AC, as it can only have voltage applied to it in one direction only. The equation still holds, however.
If the capacitor is and electrolytic then YES, you must keep the +ve to the side with no marking or a + and -ve to the side with a stripe or a - on it. If the capacitor has one leg shorter than the other the shorter leg is also the -ve side. Connecting an electrolytic the wrong way round can cause it to boil or even explode. If it is not electrolytic then it can go either way round, these are usually smaller.
A common choice is an electrolytic capacitor with a high enough voltage and capacitance rating to stabilize the voltage. To wire it, connect the positive lead of the capacitor to the positive terminal of the car battery, and the negative lead to a good ground point on the vehicle's chassis. Be sure to add an appropriate fuse in line with the positive lead for safety.
To determine polarity in CAPACITORS:Electrolytic capacitors are often marked with a stripe. That stripe indicates the NEGATIVE lead.If it's an axial leaded capacitor (leads come out of opposite ends of the capacitor), the stripe may be accompanied by an arrow that points to the negative lead.Sometimes, you can look to the length of the leads as an indication of polarity. The positive lead is usually longer but be careful if you're reusing old or 2nd hand capacitors - the leads may have been trimmed.Tantalum capacitors are often marked with a '+'sign.http://www.westfloridacomponents.com/polarity.html
The distance between the leads (lead spacing) on a radial capacitor
The Lead Capacitor
A polarized ("polar") capacitor is a type of capacitor that have implicit polarity-it can only be connected one way in a circuit. The positive lead is shown on the schematic (and often on the capacitor) with a little "+" symbol. The negative lead is generally not shown on the schematic, but may be marked on the capacitor with a bar or "-" symbol. Polarized capacitors are generally electrolytics.
You charge a capacitor by placing DC voltage across its terminal leads. Make sure when using a polarized capacitor to place positive voltage across the positive lead (the longer lead) and negative voltage across the negative lead. Also make sure that the voltage you charge the capacitor to doesn't exceeds its voltage rating.