Diacs are electronic components that control electric current in electronic circuits. Diacs, while passing electric current, limit the movement of their electronic cavity and therefore can control electric current. Diyacs play an important role in the operation of electronic devices and are available in a variety of shapes and sizes.

Diacs consist of two basic parts: an anode and a cathode. Electric current is controlled by passing it between the anode and the cathode. Diacs can control electric current by changing the resistance between anode and cathode.

Diacs are usually made of semiconductor materials such as silicon or germanium, and they conduct electric current through these materials. Diacs are often used in a serial or parallel connection and they show different properties according to these connection types.

There are also different types of diyas. For example, reversible diacs (recitfiers) only pass electric current in one direction and are therefore also known as rectifiers. Zener diacs, on the other hand, only pass electric current above a certain voltage level and are therefore also used as voltage stabilizers.