# Question: What Resistor Do I Need For 5v LED?

## What is the voltage required for an LED?

Most common LED’s require a forward operating voltage of between approximately 1.2 to 3.6 volts with a forward current rating of about 10 to 30 mA, with 12 to 20 mA being the most common range..

## Do I need a resistor for my LED tail lights?

Expert Reply: When changing from incandescent or halogen type bulbs to LEDs, load resistors are required. This kit includes two resistors and connectors for installing a pair of bulbs as turn signal lamps. …

## What happens if you don’t use a resistor with an LED?

If you don’t put a resistor in series with the LED and you apply power, the current through the LED will exceed its rating and it will be destroyed. You can use the following equation to solve for R. Vdiode is the diode’s forward turn on voltage.

## Should LED be connected in series or parallel?

Series components have the same current through them but fluctuating voltages. Generally speaking, most LED lighting uses a series-parallel combination. Ideally, for reliability and lighting consistency, it would be best to have one strip of LEDs all wired in series to a constant current driver.

## How do I know what resistor to use with LED?

Determine the voltage and current needed for your 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.

## How many LEDs can be connected 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.

## What resistor do I need to drop 12v to 5v?

PLace two resistors in series with the 2nd resistor value (5/7) of the first resistor value. Place the resistors between 12v and ground and then you will get 5v at the point between them. This is a very crude way of doing it. It is unregulated so the voltage out will be dependent of voltage in.

## How do I reduce 12v to 5v?

Convert 12V DC to 5V DCStep 1: Take All Components As Shown Below and in Pictures. Components required – … Step 2: Connect Input Power Supply. 7805 voltage regulator contain three pins.In which we have to give power supply on pin-1 and pin-2. … Step 3: Output Power Supply. … Step 4: Wiring Is Completed. … Step 5: Checking.

## How many LEDs can a 12v battery power?

The answer should be the source voltage divided by the voltage drop of 1 LED. 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.

## Can you connect LED strips in parallel?

How to wire LED strip lights in parallel. The key to installing LED tape in lengths longer than 5m is to wire your LED strips to your transformer in parallel. … You can wire multiple strips back to one single transformer – just as long as the total wattage of your LED tape doesn’t exceed the transformer’s output.

## What resistor do I need to drop 5v to 3v?

So back to our circuit, if we have 5 volts and want 3V from it, we use the formula above. If we use a 10KΩ as our R1 resistor, plugging in the values, we get R2= (V)(R1)/(VIN – V)= (3V)(10KΩ)/(5V – 3V)= 15KΩ. So we can use a 15KΩ resistor as our R2 resistor with the R1 resistor being 10KΩ. Let’s do one more example.

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

The answer to your title question is: The LED will light up. … Too much current will blow the LED. You limit the current to your desired value (often 15 to 20mA) by putting the correct resistance into the circuit. Use Ohm’s law to work that out.

## Can I use LED without resistor?

When hooking up an LED, you are always supposed to use a current-limiting resistor to protect the LED from the full voltage. If you hook the LED up directly to the 5 volts without a resistor, the LED will be over-driven, it will be very bright for a while, and then it will burn out. That’s what they say.

## Are LED load resistors safe?

If left on too long, or incorrectly sized, the load resistor’s temperature can melt insulation, cause short circuits and create a fire hazard. There are special load resistors designed for LED light circuits which, when correctly installed, minimise the maximum temperature of the resistor.

## How do I reduce 5v to 1.5 V?

In voltage divider circuit you want to drop 3.8V across R1 to get Vout = 1.5V. This can be done by n number of combinations of R1 & R2 values. For e.g. you can use R1=3.8K and R2=1.2K or R1=3.8Ω and R2= 1.2Ω.

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

Basics: Picking Resistors for LEDsPower Supply VoltageLED ColorResistor (calculated)4.5 VBlue, Green, White, or UV48 Ω5 VBlue, Green, White, or UV68 Ω5 VRed, Yellow, or Yellow-Green128 Ω5 VRed, Yellow, or Yellow-Green56 Ω4 more rows•Aug 29, 2012

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

Originally Answered: In order to light an LED with a 12V, what resistor value is needed? Normally, you want to minimize waste, so you connect as many LED in series as possible to consume the voltage provided, then you use a resistor to limit the current to the correct value. White LEDs are universally using 3.0 volts.

## Can I connect a LED directly to a battery?

Powering an LED is not as easy as simply hooking it up to a battery. An LED has almost no internal resistance. Therefore, if you hook it up directly to a battery, it will burn out quickly as the current flows unimpeded through the LED. You must add a resistor to the LED circuit.

## Are LEDs brighter in series or parallel?

If light bulbs are attached in parallel, the current will be divided across all of them. But if the light bulbs are connected in series, the current will be the same in all of them. Then it looks like the bulbs should be brighter when connected in series, but actually, they are brighter when connected in parallel.

## Can I just put LED bulbs in my car?

There are minimal tools required, and you need no particular experience to be able to fit these kits effectively. Your LEDs can be installed on any car, regardless of its age and condition, so everyone can benefit from more efficient lighting.