Electronic Resistors

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Electronics Components: Parallel Resistors

So how do you calculate the total resistance for resistors in parallel on your electronic circuit? Put on your thinking cap and follow along. Here are the rules: [more…]

Electronics Basics: Resistance

In the electronics world, resistance is not futile. In fact, resistance can be very useful. Without resistance, electronics would not be possible. Electronics is all about manipulating the flow of current [more…]

Electronics Basics: Measures of Resistance

You can measure resistance of an electronic circuit using an ohmmeter, which is a standard feature found in most multimeters. The procedure is simple: First, you disconnect all voltage sources from the [more…]

Electronics Components: Resistors

A resistor is a small component that's designed to provide a specific amount of resistance in an electronic circuit. Because resistance is an essential element of nearly every electronic circuit, you'll [more…]

Electronics Components: How to Interpret Resistor Color Codes

Resistance is an essential element of every electronic circuit, so you will work with a lot of resistors as you explore electronics. You can determine the resistance provided by a resistor by examining [more…]

Electronics Components: Standard Resistor Values

Most resistors used in electronics have four stripes of color. The first three stripes indicate the resistance value, and the fourth stripe indicates the tolerance. Some resistors have five stripes of [more…]

Electronics Components: Resistor Power Ratings

Resistors are like brakes for current flowing through an electronic circuit. Like the brakes in your car, resistors work by applying the electrical equivalent of friction to flowing current. This friction [more…]

Electronics Projects: How to Limit Current with a Resistor

One of the most common uses for resistors is to limit the current flowing through an electronic component. Some components, such as light-emitting diodes, are very sensitive to current. A few milliamps [more…]

Electronics Projects: How to Combine Resistors in Series and Parallel

Resistors can be combined to form complex electronic networks in which some of the resistors are in series and others are in parallel. For example, a network of three, 1 kΩ resistors and one 2 kΩ resistor [more…]

Electronics Projects: How to Divide Voltage with Resistors

Here is an interesting property of resistors that is useful in electronic circuits: if you connect two resistors together in series, you can tap into the voltage at the point between the two resistors [more…]

Electronics Components: How to Vary Resistance with a Potentiometer

Many electronic circuits call for a resistance that can be varied by the user. For example, most audio amplifiers include a volume control that lets the user turn the volume up or down, and you can create [more…]

Electronics Components: Combine Resistors in Series and Parallel

There are two basic ways to combine resistors in an electronic circuit: in series (strung end to end) and in parallel (side by side). The following explains how you calculate the total resistance of a [more…]

What Are Resistors Used For?

Resistors are among the most popular electronic components around because they're simple yet versatile. One of the most common uses of a resistor is to limit the amount of current in part of a circuit. [more…]

Choosing a Type of Resistor: Fixed or Variable

Resistors come in two basic flavors: fixed and variable. Both types are commonly used in electronic circuits. Here's the lowdown on each type and why you would choose one or the other: [more…]

Fixed Resistors and Color Coding

The attractive rainbow colors adorning most fixed resistors serve a purpose beyond catching your eye. Color-coding identifies the nominal value and tolerance [more…]

Variable Resistors (Potentiometers)

Potentiometers, or pots, allow you to adjust resistance continuously. Pots are three-terminal devices, meaning that they provide three places to connect to the outside world. Between the two outermost [more…]

What Is a Rheostat?

The word potentiometer is often used to categorize all variable resistors, but another type of variable resistor, known as a rheostat, is different from a true potentiometer. Rheostats are two-terminal [more…]

How to Identify Resistors on Printed Circuit Boards

As you learn more about electronics, you may get curious enough to take a look inside some of the electronics in your house. Warning: Be careful! You might [more…]

How to Calculate Current through a Component

When you have a good handle on Ohm's Law, you'll be ready to put it into practice. Ohm's Law is like a master key, unlocking the secrets to electronic circuits. [more…]

How to Calculate Voltage Across a Component

To figure out how much voltage is dropped across each resistor, you use Ohm's Law for each individual resistor. You know the value of each resistor, and [more…]

The Power of Joule's Law in Electronics

A scientist hard at work in the early 1800s was the energetic James Prescott Joule. Joule is responsible for coming up with the equation that gives you power values; it's known as [more…]

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