How do I determine the wattage of a resistor?
Unfortunately, you can’t tell a resistor’s power rating just by looking at it. Unlike resistance and tolerance, there are no color codes for wattage. However, the size of the resistor is a good indicator of its power rating. Power ratings are written on the packaging when you buy new resistors.
How do you identify a metal film resistor?
Look at the color of the resistor, a potential indication to its makeup. Tan tends to signal a carbon film resistor, whereas a light blue resistor is likely made of metal film. Count the color bands, the number of which provides a good hint toward which type of resistor you have.
What is a metal film resistor?
Metal film resistors have a thin metal layer as resistive element on a non-conducting body. They are among the most common types of axial resistors. The appearance of metal film resistors is similar to carbon film resistors, but their properties for stability, accuracy, and reliability are considerably better.
How do you read SMD resistor numbers?
Standard-tolerance SMD resistors are marked with a simple 3-digit code. The first two numbers will indicate the significant digits, and the third will be the multiplier, telling you the power of ten to which the two significant digits must be multiplied (or how many zeros to add).
What is the resistance value of metal film resistor?
The metal film resistors have low tolerance value than the carbon composition resistors. The difference between our desired resistance value (300Ω) and the actual manufactured resistance value (302.4Ω) is called tolerance.
What is metal film resistor?
What EIA-96?
The EIA-96 System It is based on the E96-series, thus aimed at resistors with 1% tolerance. In this system, the marking exists out of three digits: 2 numbers to indicate the resistor value and 1 letter for the multiplier.
What is 2R2 resistor?
2R2 Resistor color code / 2.2 Ω (Ohms) Two point two Ohms.
What is the resistance of a metal film resistor?
The resistor value is marked by color code bands or with text. The metal film resistors are available with tolerances of 0.1, 0.25, 0.5, 1 and 2%. The Temperature Coefficient of Resistance is usually between 50 and 100 ppm/K.
How are WMF series metal film resistors manufactured?
The WMF series Metal Film Resistors are manufactured using the latest Magnetron Vacuum Sputtering System. This ensures a very stable resistive medium having a very low temperature coefficient. The resistors are insulated with layers of light blue lacquer.
How big is a 1 / 4 watt resistor?
1/4 Watt Resistor – 2.5 x 6.5 x 28: It handles 27.77 mA when connected to 9 V source. 1/2 Watt Resistor – 3.2 x 8.5 x 28: It handles 55.55 mA when connected to 9 V source. 1 Watt Resistor – 5 x 11 x 28: It handles 111.11 mA when connected to 9 V source.
What is the power rating of a resistor?
The higher its size, the higher the watts it can handle. The chart below presents the power rating of different resistors and their sizes. Remember that actual size may vary. Resistors above 5 watts are termed as power resistors and are usually available in different construction.