## What size resistor do I need for LED?

LEDs typically require 10 to 20mA, the datasheet for the LED will detail this along with the forward voltage drop. For example an ultra bright blue LED with a 9V battery has a forward voltage of 3.2V and typical current of 20mA. So the resistor needs to be 290 ohms or as close as is available.

## How do you decide the value of a resistor?

To select a resistor for a specific application, the following steps are recommended:

1. 1 . (a) Determine the Resistance.
2. 2 . Determine the proper “Watt Size” (physical size) as controlled by.
3. 3 .
4. step 1 deteRmiNe ResistANce ANd wAtts.
5. step 2 poweR RAtiNg oR physicAl size oF ResistoR.
6. Ambient Temperature.
7. Enclosure.
8. Grouping.

Can I connect LED without resistor?

Never Ever Connect an LED Without a Resistor, Mostly. When hooking up an LED, you are always supposed to use a current-limiting resistor to protect the LED from the full voltage.

What is 10W equivalent to?

Only 10W in power, incandescent equivalent to 80W. These Cool White (6000K) LED bulbs are ideal for use in table and floor lamps, living rooms, kitchens, bedrooms and hallways or ceiling fixtures. Radiates a bright light of up to 1000 lumens with good heat dissipation and no flicker.

### How many lumens is a 10W LED bulb?

1050 lumens
10 Watt LED replacement bulb produces 1050 lumens of light. This LED bulb is a direct replacement for A19 style incandescent bulbs.

### Does a 12v LED need a resistor?

LEDs can be ran off multiple voltages, but a series resistor is required to limit the current in the circuit. Too much current in an LED will destroy the device. As with all diodes, LED’s will only allow current to flow in the direction from the anode to the cathode.

Can you power an LED with 5V?

No, you cannot safely power an LED with 5V without a resistor. The resistor is absolutely 100% required. The resistor isn’t put there purely on a whim, it’s required to set the current based on the supply voltage minus the LED forward voltage and the resistance of the resistor.

How is LED voltage calculated?

To calculate an LED’s power use, simply multiply the LED’s voltage (in volts) by the LED’s current (in amperes). The result, measured in watts, is the amount of power your LEDs use. For example, if your LED has a voltage of 3.6 and a current of 20 milliamperes, it will use 72 milliwatts of power.