# How many LEDs can you run off a 9V battery?

## How many LEDs can you run off a 9V battery?

To ensure full current over a reasonable range of battery voltages – 9.5 V down to 8 V – you can only have two LEDs in series on a 9 V supply. These will drop about 3.4 V each and 6.8 V in total. A series resistor will drop the remaining 2.2 V to make up the 9 V battery voltage.

Can a 9-volt battery power a LED light bulb?

If you want to make a light bulb light up using a 9-volt battery, then you need to ensure that the light bulb voltage is similar. It doesn’t matter if the voltage is slightly more, it just won’t glow as bright, but if the voltage is six or less, it’s likely the bulb will blow when you connect it to the 9-volt battery.

### How do you connect an LED to a 9V battery?

Connect one end of the resistor to the positive terminal of the battery. Connect the other end of the resistor to the positive (anode) terminal of the LED. Connect the cathode of the LED to the negative terminal of the battery. The LED should illuminate.

What is a 10 watt LED lamp equivalent to?

LED equivalents to traditional incandescent light bulbs

Incandescent Light Bulb Wattage LED Equivalent Wattage
100 Watt 10 Watt
75 Watt 7.5 Watt
60 Watt 6 Watt
50 Watt 5 Watt

#### How many LEDs can run on 12V?

A 12V battery wired to four 3V LEDs would distribute 3V to each of them. The same 12V battery wired to four 3V LEDs in parallel would deliver the full 12V to each of them. A single low voltage power supply can be shared by many LEDs.

Will a 9V battery light a 12V bulb?

The battery is six times larger than a regular AA battery. To make a light bulb light up using a 9-volt battery, you need to make sure the light bulb voltage is the same.

## Can a 9V battery power 12V LED lights?

LED’s are usually 2-3v actually. They use a resistor to keep from flowing too much current. You’ll be fine, as long as your not hooking the 9v battery DIRECTLY to the bulb, if it really is an LED, it’ll pop.

How many LEDs can a 9v battery power?

I know that a 9V battery can only power so many LEDs. I need a 9V battery to power 10 of them maybe less or a few more and keep brightness and im not sure where to go to make it happen.

### What kind of battery do I need for 10 LEDs?

That way you can hook up all 10 of your LEDs in series and get the most out of your battery. You need an LED driver that will function at say 6-12V DC and output your required current (15-18mA) at greater than 30V, say 35V. BTW: If your 9V battery is your typical transistor radio battery, do not expect it to last long.

Can a 9v battery be used for a flashlight?

I actually did something similar to this to make a little flashlight circuit recently, using a 9v battery and a matrix of nine 3v 30mA LEDs connecting like so: The thing to remember, here, is that connecting things in series means the current thru them is the same, but the voltage drops.

#### Is it bad to connect 10 LEDs in parallel?

The total current draw will be 100 mA so a PP3 type battery will not last long. Connecting LEDs in parallel without balancing resistors is usually a bad idea. The one with the lowest V f , forward voltage drop, will hog more of the current than the others and glow brighter than the rest.