What Does The AC Capacitor Do? Important Functions and Tips for Choosing the Right One.

Did you know that the capacitor is one of the most important components in an AC circuit? It helps to regulate the flow of current, and it’s responsible for keeping your equipment running smoothly.

Let’s find out what does the AC capacitor do.

Without a capacitor, your equipment would not function properly. This article will discuss what the AC capacitor does and how it works. We will also provide tips on how to choose the right capacitor for your needs.

What is an AC capacitor?

An AC capacitor is an electronic component that stores energy in an electric field. It is used to filter Alternating Current (AC) signals.

What does it do?

The AC capacitor separates the positive and negative parts of the AC signal, allowing only the positive part to pass through. This makes the signal smoother and less distorted.

How to test an AC capacitor?

If your AC unit isn’t working as efficiently as it used to, one possible cause is a problem with the capacitor. The capacitor stores electrical energy and helps to start the compressor when the AC unit is turned on.

Over time, the capacitor can become worn out and stop working properly. You can test the capacitor to see if it is the cause of the problem.

First, identify the two terminals on the capacitor. Next, use a multimeter to test for continuity between the terminals. If there is no continuity, then the capacitor needs to be replaced.

How to replace an AC capacitor?

The capacitor is a vital part of the AC unit, and if it’s not working properly, the whole system can shut down. Replacing a capacitor is not a difficult task, but it’s important to do it carefully to avoid damaging the unit. Here’s how to do it:

First, shut off the power to the unit and remove the access panel. Locate the old capacitor and disconnect it from the wires. Be sure to note which wire goes where, so you can connect the new capacitor in the same way. Install the new capacitor and reattach the wires.

Finally, replace the access panel and restore the power. Test the unit to make sure it’s working properly.

Common problems with AC capacitors

There are a few common problems that can occur with AC capacitors. One is that the capacitor can start to leak, which can cause damage to the unit. Another problem is that the capacitor can fail to start the compressor, which will prevent the AC unit from cooling your home.

If you suspect that there is a problem with your capacitor, it’s best to have a professional take a look. They can test the capacitor and replace it if necessary.

Tips for choosing a new AC capacitor

Here are some tips for choosing a new AC capacitor.

First, make sure it has the same amp rating as to your old one so you don’t risk frying anything else in its midst!


In order to avoid headaches down the road when replacing these vital parts on an air conditioner unit, consider buying from someone who specializes in repairing home appliances like refrigerators or washing machines too – they will know exactly what’s needed based off ratings alone without having any guesswork involved due to this being something subjective such as size etcetera.

Lastly, remember, no matter which brand/model of machine YOU choose, make certain there is a seal of approval or certification on the capacitor – it could be UL, CSA, ETL, or any other similar type organization’s stamp.

Without this, you have no guarantee that what you have purchased is safe to use!

Now that you know what the AC capacitor does, you can make sure to choose the right one for your needs.

Daniel Wood

Daniel, who is a mechanical engineer and hobbyist mechanic by profession has been specializing in electronic equipment for the past four years. He worked as an engineer at one of these manufacturing plants that specializes exclusively on this type equipment before opening up his own shop where he does research into different machines all day long!