# What voltage is needed to light an LED?

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One question that people who are new to circuits usually ask is, “how many volts are needed to power an LED?” “It’s usually between 2 and 3 volts and it depends on the color and type of LED”, says MIT Electrical Engineer grad, Luz Rivas. Luz said that you need to look it up the voltage to know for sure.

## Do LED lights require AC or DC?

In most applications LEDs are driven by a DC power supply. LEDs consume DC current to produce light; with AC current the LED will only be lit when current flow is in the proper direction. AC applied to an LED will cause it to blink on and off, and at high frequency the LED will appear to be lit continuously.

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

Then, 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.

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## How do you light an LED with 12V?

Connect the positive terminal of the 12 volt power supply to one side of the resistor. Connect the other side of the resistor to the anode of the LED. Check the LED data sheet to identify the anode and cathode. The cathode is commonly the shorter lead and located nearest any flat side of the LED.

## Can you use a 220v LED light bulb with 110v current?

Re: can 220v led be used on 110v? You can use a transformer/voltage converter to boost your 110v to 220v so that you can use the bulb.

## How do I connect 220v AC to LED?

How to Assemble

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

20 апр. 2020 г.

## Do I need a special transformer for LED lights?

All mains powered LED bulbs require a transformer. Depending on the bulb type, the transformer/driver may be built in to the bulb casing or may be located externally. The purpose of the transformer is to reduce mains voltage (240V) to the desired level relative to the bulb being powered (e.g. 12V or 24V).

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

So, a 12V battery wired to four 3V LEDs in series would distribute 3V to each of the LEDs. But that same 12V battery wired to four 3V LEDs in parallel would deliver the full 12V to each LED – enough to burn out the LEDs for sure! Wiring LEDs in parallel allows many LEDs to share just one low voltage power supply.

## How many amps does a 12 volt LED light use?

Each segment of 3 LEDs draws approximately 20 milliAmperes from a 12V supply, per string of LEDs. So for each segment, there is a maximum 20mA draw from the red LEDs, 20mA draw from the green and 20mA from the blue. If you have the LED strip on full white (all LEDs lit) that would be 60mA per segment.

## Can a LED be connected directly to a 9v battery?

Connecting the light emitting diode (LED) to a higher voltage will normally quickly destroy the LED, by causing it to burn out. … Five-volt LEDs can be connected to a nine-volt battery, but an external resistor is also needed in order to drop the voltage to the five volts required.

## 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.

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

you can use 9v battery for 12v Led . Just only the brightness is less than 12v battery . … if you need only Light purpose then you can use 9 volt instead of 12 volt supply.

## 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. Such a resistor is often called a ballast resistor. … If the voltage source is equal to the voltage drop of the LED, no resistor is required.

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## Can I use a higher voltage light bulb?

A 120 volt bulb will work on 110 volts, however if operated at a higher voltage such as 130 volts the bulbs life will be significantly shortened. Either bulb will work; the fixture is rated for 110 volts so the 110 volt bulbs will work fine as well.

## Can I use a 120V bulb in a 240V socket?

You can use a 120V or a 240V bulb. The bulb would have to match the mains voltage. … The maximum voltage is simply the highest voltage that the fixture is rated to withstand, without arcing or breaking down in some fashion. The maximum current, if given, will be independent of voltage.

## Will a 110v light work on 240V?

Can I convert a lamp from 110-120v to 220-240v without rewiring? Yes. 