What Resistor Do I Need To Reduce Voltage

Simple example provided with the calculator.

What resistor do i need to reduce voltage.

It is good to refresh about resistors now. To calculate the desired resistance you divide the voltage 3 v by the current 0 025 a. The dropping resistor calculator works for things like running led s from different voltages. The actual current drawn by the router is probably much lower and will change depending on how you are using.

The formula to calculate resistance in a circuit is. You need a voltage regulator. To divide voltage in half all you must do is place any 2 resistors of equal value in series and then place a jumper wire in between the resistors. Even if the supply has bleeder resistors they might take a while to get rid of the residual charge.

All the calculators in step 2 are just doing some simple math that you can do at home. Round this up to the next preferred resistor value and you have 150r although 110r would do fine. Resistors are electrical devices that act to reduce current flow and at the same time act to lower voltage levels within circuits. Do not connect the led directly to the battery without a resistor.

R v i or more relevant to what we re doing. Source volts led volts current 1000 resistance so if we have a 12v battery powering a 3 5v 25ma led our formula becomes. The result is 120 ω. Trying to run something at a different voltage then you can try a simple resistor to do the job.

Your router only draws a maximum of 0 9 a not ah. 12 3 5 25 1000 340ohms.