# How do you calculate a resistors value?

## How do you calculate a resistors value?

To calculate the resistance value, you need to group the values of the significant digits bands — i.e., the values of the first two or three bands from the left, depending on the total number of bands. Then you need to multiply that value by the multiplier to get the resistance value of the resistor.

## What does a 5\% resistor mean?

The tolerance gives the \% deviation that the real value is allowed to be different from the stated or nominal value. For example, a 100-ohm 5\% resistor can be anywhere between 95 and 105 ohms. If you find a 5\% resistor that is exactly the nominal value, i.e. 100 ohms, then that is just plain luck.

What is the value of this resistor?

Resistor Markings

Value 1st Band Multiplier x
180 ohms Brown Brown
3,900 ohms Orange Red
47,000 ohms (47k) Yellow Orange
1,000,000 ohms (1M) Brown Green

What is the nominal value of a resistor?

Standard resistors have four color bands. Three of the bands tell you the nominal value, which means the value the resistor was designed to have. The fourth band tells you the tolerance of the resistor, which indicates how far off the nominal value the actual resistance could be.

### What is the value of resistor with the following colors?

The fourth band (or 5th for the 5-band and 6-band) indicates the tolerance values. Here, two colors are added (gold and silver). The 6th band for a 6-band type resistor is the temperature coefficient….Resistor Band Colors.

Color Value
Orange 3
Yellow 4
Green 5
Blue 6

### Why do resistor values differ from nominal values?

Resistors have a nominal value indicated by colored bands or other labeling. 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.

How we determine the value of a resistor using color code?

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Reading and Determining the Resistor Value Hold the resistor with the gold or silver band to the right and read the color codes from the left to the right. Select the color codes from the bands on the resistor. Read the colors from left to right. The resistance value based on the color code provided is now displayed.

What is a resistor color code?

Resistor Color Coding uses colored bands to quickly identify a resistors resistive value and its percentage of tolerance with the physical size of the resistor indicating its wattage rating. The colors brown, red, green, blue, and violet are used as tolerance codes on 5-band resistors only.

## What is the value of 10R resistor?

The more commonly used SI notation for ohms (mainly because omega isn’t easily found on the keyboard) is to use R. For example, 10W is written as 10R, 4700W is equivalent to 4.7KW and is written as 4K7 where the K replaces the decimal point and represents 1000.

## What is the value of the resistor at 52 MΩ?

This means that the value 52 MΩ can vary by up to 5\% in either direction, so the value of the resistor is 49.4 MΩ – 54.6 MΩ. Coded components have at least three bands: two significant figure bands and a multiplier, but there are other possible variations.

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How many resistors do I need for a blue LED?

Example 1: The blue LED has a typical forward voltage drop of 3.2 V, therefore a 5 Ω resistor is required when using a 3.3 V supply voltage. However, if you are using a 5 V supply voltage, then a 90 Ω resistor is needed.

What are the resistor values for LED lights?

Hence, resistor values of 75 Ω, 160 Ω, 360 Ω, and 510 Ω, can be utilised when the supply voltages are 3.3 V, 5 V, 9 V, and 12 V, respectively. The voltage across the rail Vs is equal to the sum of voltages across the LED and resistor.

### How do you calculate the voltage across a resistor?

Formula for calculating resistor values. The voltage across the rail Vs is equal to the sum of voltages across the LED and resistor. Given the forward voltage of the diode Vf, the voltage across the resistor is equal to Vs –Vf.