# What Voltage Do LEDs Use?

## What resistor do I need for 12v LED?

We’ll use the following formula to determine the resistor value: Resistor = (Battery Voltage – LED voltage) / desired LED current.

For a typical white LED that requires 10mA, powered by 12V the values are: (12-3.4)/.

010=860 ohms.

To use several LEDs in parallel, sum the current values..

## How do I connect 220v to LED?

How to AssembleConnect black anode of diode to negative of the led 0r as you want.connect the resistor to the positive of the LED or as you want but circuits should according to rules.Connect the free ends of the diode and resistor to the male pins.as shown in the pic.

## How many LEDs can a 9v battery power?

29v can power 2 white/blue LEDs in series, or 3 red / (most) green / yellow. Each chain would need an appropriate resistor in series.

## How long will a 12 volt battery run LED lights?

Also, how long will a 12 volt battery run LED lights? 7 hours is 27% of 25.76 hours. You have 40 W total load; at 12 volts the current is 40/12 amps This is 3.33 amps; time to 100% discharge 85/3.33 = 25.5 hours approx. If you use 80% of the charge, that gives 0.8 x 25.5 hours which is 20.4 hours.

## What is the difference between 3mm and 5mm LED?

5mm LEDs can be so bright, they are often used as illumination (lighting something up, like a flashlight, we’ll talk about this next). 3mm LEDs are not as bright but are smaller, and are good for indication (like an LED that tells you something is on).

## What resistor do I need for LED?

The resistor must have a value of at least 183.3 ohms. Note that the voltage drop is 5.5 volts. It would have been possible to connect additional LEDs in the circuit.

## Can high voltage damage LED lights?

The reason why a power-line has high voltage and low current is that power-lines are super long, which increases its resistance. … LEDs have a tolerance of a specific amount of reverse voltage that it can withstand but once this is exceeded, the LED can be damaged.

## What happens if you put too much voltage through an LED?

If the voltage of the source is above the forward voltage of the LED it will try and draw an infinite amount of current from the source. That current will lead to a voltage drop across the resistance RZ, which results in the output voltage of the source being reduced.

## How many LEDs can run on 12v?

So if your source is 12v, and your LEDs have a voltage drop of 3.5, 12/3.5v, gives you 3 LEDs. If the the forward voltage drop of the LEDs was exactly 3 volts, you’d be able to drive 4 of them, and would not need a current limiting resistor.

## Do I need a resistor for a 12v LED?

1 Answer. AFAIK there is no, or at least no common, led diode that is typically 12V forward voltage by it self. 12V led are modules that consist of some combination of diodes and resistors to make them suitable for 12V power applications without needing extra current limiting.

## Will a 9v battery power a 12v LED?

No. The other posters are probably correct in that you probably could run the 12V LEDs from 9V, albeit at reduced brightness. But they are making an assumption about the wiring of the LED(s) in the light.

## Will 12v AC LED run on DC?

Will 12v AC LED run on DC? Yes, surprisingly. I’ve just tried an MR16 lamp that has ’12V AC 50Hz’ stamped on it. The connectors are not marked for polarity in any way, so I just connected up to a bench DC power supply and gradually wound up the voltage.

## What’s the difference between 12v AC and 12v DC?

12V DC is safer than 12V AC. Body resistance decreased when the 12V AC still may cause the dead, 12V DC will not be in 100%. However, the hazard degree of electric shock to the human body mainly depends on the size of the current passing through the human body and the length of the energization time.

## Do LEDs get brighter with more voltage?

Adjusting the voltage lower or higher will change the brightness, but only because it also changes the current- higher voltage means the current will increase in an LED.

## How do I know what voltage my LED is?

How to find voltage and current of LEDThe easiest way is to look it up in the datasheet.You could find the LED voltage by using a multimeter with diode function.You could connect a battery to the LED and a potentiometer. Start with a high resistance on the potentiometer and gradually decrease it until you have an nice brightness.

## Do LEDs run on AC or DC?

In most applications, LEDs are driven by a DC power supply, but AC offers several significant advantages. Lynk Labs has developed technology that allows LEDs to be driven directly from an AC supply. LEDs are usually considered to be DC devices, operating from a few volts of direct current.

## What is the voltage of 5mm LED?

This is a very basic 5mm LED with a red lens. It has a typical forward voltage of 2.0V and a rated forward current of 20mA.

## Can I run a 24v LED on 12v?

12-volt lights are compatible with 24-volt systems – they use electricity and can be wired into the system. Light bulbs and light strips are designed to operate at slightly lower and slightly higher voltages. They can dim and brighten somewhat while still operating safely.

## How many LEDs can you put in parallel?

Wiring LEDs in parallel allows many LEDs to share just one low voltage power supply. We could take those same four 3V LEDs and wire them in parallel to a smaller power supply, say two AA batteries putting out a total of 3V and each of the LEDs would get the 3V they need.

## Is 12v AC or DC?

AC means Alternating Current and DC means Direct Current. AC and DC are also used when referring to voltages and electrical signals which are not currents! For example: a 12V AC power supply has an alternating voltage (which will make an alternating current flow).

## Are LEDs voltage sensitive?

Because LEDs are extremely sensitive to under- or over-voltage, you must calculate voltage drop carefully and correct for it. … Sometimes it works as if the source is an incandescent lamp; other times, if the voltage is too low, for example, standard dimmers do not work.