# Resources

## How A Potential Divider / Voltage Divider Works

Two or more resistors when connected in series make up a potential divider circuit, this tutorial explains how they work and the voltage across them. Circuit diagrams, formulas, worked examples and some questions to test your understanding are included in the tutorial.

## LED Resistor Value Calculator

This calculator works out the resistor value to accompany an LED by entering the battery voltage along with the LED forward voltage and typical current. Parameters for Kitronik LEDs can be picked from a list and the calculator even recommend a preferred resistor value complete with colour bands.

## What Is Ohm’s Law

Ohm’s law is used to describe the relationship between Voltage (V), Current (I) and Resistance (R). In this tutorial you will learn about the formula that connects these three values, see some examples and answer some questions to test your understanding.

## Understanding Logic Gates

A guide to understanding how logic gates work.

## How A Thermistor Works

A guide to understanding how a thermistor works. A thermistor is a component that has a resistance that changes with temperature. There are two types of thermistor. Those with a resistance that increase with temperature (Positive Temperature Coefficient – PTC) and those with a resistance that falls with temperature (Negative Temperature Coefficient – NTC).

## How To Use A Thyristor As A Latch

A guide to using a thyristor as a latch.

## How A Darlington Pair Transistor Works

A Darlington pair is two transistors that act as a single transistor but with a much higher current gain, this tutorial provides an example circuit with explanation about how the part is used.

## How To Calculate Capacitors In Series And Parallel

Calculate the combined total capacitance of capacitors in parallel and series using the formula and explanations detailed in this tutorial. As well as explaining the formulas and maths involved there is also some tasks for you to test yourself for two and three capacitor networks.

## How to Calculate Resistors in Series and Parallel

Calculate the combined resistance of resistors in series or in parallel using the formulas and explanations described in this tutorial. As well as explaining the formulas and maths involved there is also some tasks for you to test yourself for two and three resistor networks.

## How To Calculate And Understand Resistor Values

The value of a resistor can be calculated using the colour bands on the resistors casing, find out what each colour means and how to read them with this tutorial. Resistor tolerances, a worked example, the resistor preferred value system and some tasks for you to try are also included.