# What are the colors of resistors?

Components and wires are coded with colors to identify their value and function. The colors brown, red, green, blue, and violet are used as tolerance codes on 5-band resistors only. All 5-band resistors use a colored tolerance band.
A.

### What is a resistor color code?

An electronic color code is used to indicate the values or ratings of electronic components, usually for resistors, but also for capacitors, inductors, diodes and others. A separate code, the 25-pair color code, is used to identify wires in some telecommunications cables.
• #### Who invented the resistor and when?

Otis Frank Boykin
• #### How do you read a resistor color code?

Steps
1. Position the resistor with the gold or silver color band to the right..
2. Read the color sequence that must be decoded to determine resistance.
3. Determine the coded number for the resistive value.
4. Determine the tolerance of the resistor.
5. Determine the decoded number for the resistive value.
• #### What is the definition of a resistor?

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
B.

### How do you read a resistor color code?

Steps
1. Position the resistor with the gold or silver color band to the right..
2. Read the color sequence that must be decoded to determine resistance.
3. Determine the coded number for the resistive value.
4. Determine the tolerance of the resistor.
5. Determine the decoded number for the resistive value.
• #### What is a resistor made up of?

Resistor composition. Resistors can be constructed out of a variety of materials. Most common, modern resistors are made out of either a carbon, metal, or metal-oxide film. In these resistors, a thin film of conductive (though still resistive) material is wrapped in a helix around and covered by an insulating material.
• #### How do you read a capacitor?

Method 2 Reading Compact Capacitor Codes
1. Write down the first two digits of the capacitance.
2. Use the third digit as a zero multiplier.
3. Work out the capacitance units from context.
5. Read the tolerance code on ceramic capacitors.
• #### How do you check a resistor with a multimeter?

Steps
1. Remove power from the circuit containing the resistor.
2. Isolate the resistor from the circuit.
3. Inspect the resistor.
4. Read the resistor value visually.
5. Prepare a digital multimeter (DMM) to measure the resistor.
6. Measure the resistance.
7. Determine the actual resistance of the resistor.
C.

### How can we calculate tolerance value of resistors?

The tolerance band is silver, so we multiply our resistance by 0.1. This means that our resistor's value can be as high as 16.5 Ω or as low as 13.5 Ω. For the third resistor, we'll perform the calculation in an alternative way. Take the nominal value and multiply it by 1 + your tolerance, which is (1+0.1).
• #### How can we calculate tolerance value of resistors?

The tolerance band is silver, so we multiply our resistance by 0.1. This means that our resistor's value can be as high as 16.5 Ω or as low as 13.5 Ω. For the third resistor, we'll perform the calculation in an alternative way. Take the nominal value and multiply it by 1 + your tolerance, which is (1+0.1).
• #### What is the color code for a 220 ohm resistor?

220R / 220 ohm Resistor Colour Code
Value220 Ω
Type4 Band Colour Code System
Colour CodeRed, Red, Brown, Gold
MultiplierBrown, 10
ToleranceGold Band ±5%
• #### Why is there a difference between the measured value and the nominal value of the resistors?

The actual (measured) resistance will vary from the nominal value due to subtle mechanical and chemical differences that occur during manufacturing. The manufacturer specifies the maximum deviation from the nominal value as a ±percentage. This range of deviation is called the tolerance of the resistor family.

Updated: 3rd October 2019