Electrical Circuit Basics Part 1 - Line & Load

Bryan teaches the Kalos techs the difference between line and load in part 1 of his electrical circuit basics series. This video will help lay the foundation for understanding diagrams and schematics by showing how electrical circuits are organized.

You need to have two points before electrons can move; electrons move from one side to another based on the potential difference in charge (voltage) between the two points. That's why we use two meter leads to read voltage.

If we were to have +/-120 volts on L1 and +/-120 volts on L2, we'd have a 240v circuit between those two legs. On a battery, that circuit would be between the positive and negative sides of the battery. When working on a system, it is counterproductive to focus on each individual point; you have to keep the entire circuit in mind.

We can connect one side of a battery to a switch, and the other side of that switch could connect to a lightbulb, and the other side of that lightbulb could connect to the other side of the battery to make a basic electrical circuit. The line side of a switch refers to the wire that goes into the switch (from the battery or power source), and the load side of a switch refers to the wire between the switch and the load (the component that does something; in this case, the load is a lightbulb).

In some cases, you may have multiple switches; if any switch is open, then the light can't light up. However, each switch has a line and load side. The line side is always on the side of the power source, and the load side is always nearer to the load.

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