Let’s open up a transformer and dig through it to see how they work. Transformers are extremely useful devices used in electrical systems to raise and lower voltage. They’re also used for isolation, typically in cleaning up power. They only exist in the world of Alternating Current however, so in DC circuits you won’t find transformers used.
Category: How Stuff Works
Contactors are heavy-duty electromagnetic switches that are normally used in controlling large lighting loads and motors. They operate similar to relays, but often times deal with more voltage, higher amperage, and have more input and output options.
The Kelvin Scale is used to talk about color of objects at certain temperatures, whereas other temperature scales deal with actual heat or thermal temperature. Kelvin is used in lighting especially for that reason, to talk about the color of light emission.
A relay is a type of electromagnetic switch, similar to a contactor, that can be controlled remotely with electricity, rather than needing manual input as a standard switch would.
A lot of people still use wattage to talk about the brightness of lamps, when in reality lumens are the measure of light output. Wattage is still useful to know as an electrician, but we need to stop using it to talk about the BRIGHTNESS of a light.
There are so many different types of lamps out there that having an understanding of the “lamp families” helps you understand how to troubleshoot them easier. Let’s dive in.
A lot of people get really confused by contactors and relays and tend to treat them like some kind of mystical magic device without understanding what exactly they do. They have some similarities but still have very distinct differences.
A lot of apprentices (and journeymen) have trouble understanding what makes HID lighting any different than regular lighting so troubleshooting them can be a bit confusing. Let’s talk about it!
In this episode I talk about the various fault detecting devices on the market in use in most modern residences. Cheifly Arc Fault and Ground Fault Circuit Interrupters.
Electrical power is often expressed in two units, Watts and VA. Wattage and Volt-Amps rather, get misused because many people do not understand the differences in them and when they should be used. In this episode I break down the differences in the two terms and how they relate to one-another in the electrical industry.