# How many LED load resistors do I need?

## How many LED load resistors do I need?

So if you replace 1 set of bulbs (the front OR rear bulbs) you will need to install 2 resistors (one for each side). The 3 OHM is the equivalent load of 2 bulbs. If you replace your front AND rear bulbs (4 bulbs total) you can use use two 3 OHM resistors.

**Do I need a resistor for each LED?**

An LED (Light Emitting Diode) emits light when an electric current passes through it. The simplest circuit to power an LED is a voltage source with a resistor and an LED in series. If the voltage source is equal to the voltage drop of the LED, no resistor is required.

### Can you use multiple resistors one LED?

You can use a single resistor with parallel LED’s…. Just remember that the number of lit LED’s must be constant. If you add more LED’s then the R value must be decreased. Simple example: A circuit has 1 resistor and 1 LED and draws 20mA.

**Do resistors make leds brighter?**

The LED uses the power to make light (more power, more light). The resistor does not make light, it makes heat (more power, more heat). If you need to make an LED brighter, adding batteries is wasteful: you’re better off using a smaller resistor!

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

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.

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

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.

## How do I choose a resistor for an LED?

**Do you need a resistor for every LED in parallel?**

No you don’t, if an LED requires 3V of power and you have a source that provides 3V of power then resistor is not necessary. If an LED requires 12V of power and you have a car battery — you can connect it directly and power it that way.

### How can I brighten my LED lights?

You increase the brightness of LED’s by increasing the power or voltage. Since almost all LED lights are underpowered, increasing the power by as much as 25% shouldn’t do much harm. The only downside is they will run a little hotter and you you will shorten the lights lifespan.

**Which resistor should I use with my led?**

The simplest circuit to power an LED is a voltage source with a resistor and an LED in series. Such a resistor is often called a ballast resistor. The ballast resistor is used to limit the current through the LED and to prevent that it burns.

#### How to calculate the value of resistor for led?

Summary For protecting the LED from high current we are using Resistors in series. Ohm’s law states that, V = IR The required value for the resistor can be obtained by the equation. R= (Vs – Vled )/I Source voltage, voltage drop, current, and color of LEDs determine the value of the resistor.

**What do resistors do I need for led’s?**

You should at least have a 1ohm resistor.. it’s the current that matters, not the voltage. LED only uses as much voltage as it wants.. but increase or decrease the current, and it gets brighter or dimmer. it depends on the power supply, if it is 3 volts and the led is so, then no bui if the power supply’s voltage is higher, then yes.

## What is the standard value of a resistor?

Standard Resistor Values. This page provides a quick reference for standard resistor values based on a specified tolerance. Standard Resistor Values : 0.1%, 0.25%, 0.5%. Standard Resistor Values : 1%. Standard Resistor Values : 5%. Standard Resistor Values : 10%.