12V LED Resistor Calculator
This calculator finds the resistor value to be used with an LED and a +12 Volt supply. It also provides the power dissipation in the resistor – an important number …
Matt Brown
Why is a Resistor Required for an LED?
A current limiting resistor is used in series with a Light Emitting Diode (LED). In this post we will explain why we need this resistor. LED Current and Voltage Specifications …
Parallel Circuit Voltage Calculator
Use this tool to calculate the equivalent impedance of any number of resistors in parallel, the voltage drop across each and the total current. There are two configurations considered in …
Vpp to Vp Calculator
This tool converts a peak-to-peak voltage to peak voltage for an AC waveform. Referring to the picture of a sine wave above, there are three different voltage levels: Formula Vp …
Total Resistance Calculator
This calculator determines the total effective resistance of any number of resistors in series and parallel configurations. Series Resistance Calculator Enter the resistor values separated by commas. Series Resistance Formula …
Total Resistance Calculator – Series
This calculator determines the total effective resistance of any number of resistors in a series configuration. Series Resistance Calculator Enter the resistor values separated by commas. Series Resistance Formula Rtotal …
Current Through Voltage Divider Calculator
This tool calculates the current through a voltage divider network consisting of any number of resistors. Enter Formula Using Ohm’s Law, the total current is given by Itotal = Vin/(R1+R2+R3+…) …
Voltage Divider Calculator 3 Resistors (with Examples)
This tool calculates the voltage across each of three (3) resistors in series. Enter the Input Voltage Vin, and resistor values R1, R2, and R3. Formula V1=Vin*R1/(R1+R2+R3) V2=Vin*R2/(R1+R2+R3) V3=Vin*R3/(R1+R2+R3) The …
Dipole Antenna Length Calculator
Use this calculator to find the dimensions of a Dipole antenna [1] designed to operate at a specified wavelength or frequency. A half-wave dipole antenna is comprised of two quarter-wavelength …
Voltage Divider Calculator
Introduction This post includes two calculator tools Calculator 1 Enter The tool will calculate voltage drop V1 across R1 and V2 across R2. Formula Ohm’s law is used to calculate …