How do you connect LED strip lights to mains?
To get your strip light working, connect the transformer / driver to the strip light ( extending the cable with 2 core flex if necessary). Then you connect your transformer / driver to the mains via a plug or direct to the mains and you’re away.
What happens when an LED is directly connected to a power supply?
When LED is connected to a power supply with a voltage higher than its forward voltage, a current limiting resistor is connected in series with the LED. The current limiting resistor limits the current for the LED and regulates the difference in voltage drops between the LED and the power supply.
Do LED lights need a cord?
LEDs draw very little power so they can run for a long time on a small battery without any issues. There is no need for a bulky wall transformer and a wall plug to light your project. When LEDs get toward there end of life they fail by dimming over time, rather than an abrupt failure of incandescent bulbs.
How do you power an LED?
The simplest way to power an LED is to use a DC constant voltage source that is already powering other electronics in the circuit. Current can be controlled with a series resistor. See Figure 3. This is inexpensive and convenient, especially if power is already being supplied to other components.
Can I power 12V LED strip with USB?
So, in short: no. If your LED strip needs 12V, you need to connect it to a 12V power supply, not a USB port. … As @dandavis suggested in the comments, if you really want to power it from USB, you can get a 5V->12V step-up converter to get 12V from your USB supply.