Resistor Guide: Types, Uses & FAQs.
Whenever an electronic device needs to limit or regulate the amount of current or voltage within a circuit, resistors are a must-have component. They come in different types, sizes, and materials, and are used in various applications to ensure proper functioning of the electronic system. In this resistor guide, we will explore different types of resistors, their uses, and some frequently asked questions.
1. Types of resistors.
a. Carbon resistors.
These are the most common type of resistors, usually an opaque, cylindrical component with a colored band indicating the resistance value. Carbon resistors are suitable for low frequency applications, are cost-effective, and are widely available.
b. Metal film resistors.
These resistors use a thin metal film deposited on a ceramic substrate. They are more accurate than carbon resistors, have a lower noise level, and are suitable for applications that require higher stability.
c. Wire wound resistors.
These resistors have a coiled wire element wrapped around a ceramic or fiberglass core. They can handle high current and power ratings, and are suitable for high frequency applications. Wire wounds resistors have low noise levels, high linearity, and stability.
d. Thick film resistors.
Thick film resistors have a resistive paste deposited onto a ceramic substrate, and are fired to form a resistive layer. They are cost-effective, have a high power rating, and are suitable for high frequency applications.
2. Uses of resistors.
a. Voltage division.
Resistors are used to divide voltages in a circuit. This is achieved by placing two resistors in series, and the voltage across each resistor is proportional to its resistance value.
b. Current limiting.
Resistors are used to limit the amount of current flowing in a circuit. This is achieved by placing a resistor in series with a load, and the voltage drop across the resistor results in a reduced current flowing through the circuit.
c. Heating elements.
Wire wound resistors are suitable for use as heating elements in power applications. They can generate heat by converting electrical energy into thermal energy.
3. Frequently Asked Questions.
a. What is the tolerance value of a resistor?
The tolerance value of a resistor is the permissible deviation in resistance value from its nominal value. For example, a 5% tolerance resistor with a nominal value of 100 ohms can have a range of 95 ohms to 105 ohms.
b. How are resistors rated for power?
Resistors are rated for their power-handling capacity, which is the maximum power they can dissipate without failure. The power rating is usually expressed in watts, and depends on the resistor's size, material, and environmental conditions.
c. How do I read the color code on a carbon resistor?
Carbon resistors are typically marked with a color band on their body to indicate their resistance value. The color code chart is as follows: Black (0), Brown (1), Red (2), Orange (3), Yellow (4), Green (5), Blue (6), Violet (7), Grey (8), and White (9). The first two bands indicate the significant digits, the third band indicates the multiplier, and the fourth band indicates the tolerance value.
The company is the world’s best all types of resistors custom, metal film resistor construction supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.