Continuity refers to being part of a complete or connected whole. In electrical applications, when an electrical circuit is capable of conducting current, it demonstrates electrical continuity. It is also said to be “closed,” because the circuit is complete.
To test the continuity of a circuit requires the use of a multimeter (also called a multitester) or a continuity tester (a simple device that lights up to indicate continuity). Set the multimeter to the ohm setting. The symbol for ohm is , the Greek letter omega. If there is more than one ohm setting, choose X1.
A continuity tester is an item of electrical test equipment used to determine if an electrical path can be established between two points; that is if an electrical circuit can be made. The circuit under test is completely de-energized prior to connecting the apparatus.
In electronics, a continuity test is the checking of an electric circuit to see if current flows (that it is in fact a complete circuit). A continuity test is performed by placing a small voltage (wired in series with an LED or noise-producing component such as a piezoelectric speaker) across the chosen path.
Continuity is the presence of a complete path for current flow. A circuit is complete when its switch is closed. A digital multimeter’s Continuity Test mode can be used to test switches, fuses, electrical connections, conductors and other components.
Testing continuity with a multi-tester is done by using the ohm setting on the tool, which measures resistance of an electrical pathway. In essence, the less resistance in a pathway the greater the continuity.
The electrical continuity of a system is its ability to conduct electric current. Each system is characterized by its resistance R. If R = 0 Ω, the system is a perfect conductor. If R is infinite, the system is a perfect insulator. The lower the system's resistance, the better its electrical continuity will be.
Therefore, this shows electrical continuity throughout the tester circuit. All other continuity tests are just the same thing happening in different layouts or configurations of wiring. The picture of the multi-meter showing a reading of 0.00 ohms is the equivalent of this "flashlight tester" having its light come on.
They measure whether an electrical circuit is open or closed. A light switch circuit is closed when the light is on and open when the light is off. Closed circuits have continuity and conduct electricity, whereas open circuits do not have continuity because they cannot conduct electricity.