One light out of 2 wires would be positive and the other ground. The mainly black or white wire would be available and provided. In this case, black light is positive, and white is ground. With 3 wires, LED lights become multi-function lights.
There are three different wires. Each colored line represents a different wire. The blue line connects all the lights together in series and supplies power to the light bulbs. The yellow and red wires are both connected to the blue line on either side of the light bulbs.
Light Emitting Diode (LED) Polarity
It is very important that LEDs are connected to a circuit in the right direction. The current flow can flow only from the ANODE (+) terminal to the CATHODE (-) terminal.
For LEDs, the red wire should be positive and the black wire negative. That's it.
The positive side of the LED is called the "anode" and is marked by having a longer "lead," or leg. The other, negative side of the LED is called the "cathode." Current flows from the anode to the cathode and never the opposite direction.
Incorrect polarity connection that has caused LED failure will typically result in no light emission and open-circuit LEDs. This could result in signatures ranging from no naked-eye/visible signs of damage to physical damage including signs of burn/overheat.
With a two wire fixture, this means the connections of the ground and positive wires are GND to + and + to GND, instead of GND to GND and + to +. Reverse polarity has the potential to cause damage to the internal components of your fixture.
That's right, unlike incandescent lighting the polarity of an LED matters- so if it is reversed it will not light up. Don't worry, it's an easy fix, just reverse your connections and voila!
One light out of 2 wires would be positive and the other ground. The mainly black or white wire would be available and provided. In this case, black light is positive, and white is ground. With 3 wires, LED lights become multi-function lights.
Connect the positive (Red) wires and negative (Black) wires of one lamp to the power supply , connect the sync wire with the positive wire after 2.5 seconds, then all the lamp will back to the first flash pattern. Then all the lamp will be synced.
Most people would likely recommend using a solid core 18-gauge wire for your LED lights. The cost difference between this wire size and a much smaller cable is negligible, and 18-gauge is about as big as you can go if you would like your wires to fit into most holders or terminals.
All the wiring that is commonly used in houses is perfectly fine for use with LEDs. Many LED fixtures have a transformer already built in and can be connected to a standard electrical outlet. Some LED products, i.e. LED strip lights, require an external power supply.
The anode (longer lead) is the positive lead and the cathode (shorter lead) is the negative lead.
Explanation: Reverse bias is when the p-side of the diode is connected to the negative voltage of the battery and the n-side is connected to the positive voltage of the battery. When current flows through the LED, it is forward biased and light glows from the diode. When it is reverse biased, the LED emits no light.
But here's the catch: If you connect the circuit wires to the wrong terminals on an outlet, the outlet will still work, but the polarity will be backward. When this happens, a lamp, for example, will have its bulb socket sleeve energized rather than the little tab inside the socket.
When live wire comes in contact with the neutral wire, then the insulation of wires is damaged or there is a fault in the appliance. In such a situation, the current in the circuit abruptly increases. This is known as short circuiting.
A standard box will have three sets of electric wires connected. There may be the black or red current wires, the white neutral wires, and the silver or copper ground wires.
The longer lead of the LED is called anode and is the positive terminal, so should be connected to the positive terminal of the battery. Similarly, the shorter lead of the LED is called cathode and is negative terminal, so it is connected to the negative terminal of the battery.
In LEDs, the longer lead is always connected to the positive terminal and shorter lead is connected to the negative terminal.
We know that LED has two terminals. One is cathode which is connected to the negative terminals of the battery and other is anode connected to the positive terminal of the battery.
LED (right) stands for "Light Emitting Diode". A diode is an electronics component that only lets electricity flow in one direction. One of its leads is longer than the other: that's the positive lead, the one that goes to your 5v connection. The shorter wire, the negative lead, goes to ground (Gnd).
A really nice thing about LEDs is that they are very simple. Unlike some chips that have dozens of pins with names and special uses, LEDs have only two wires. One wire is the anode (positive) and another is the cathode (negative).