Wattage Resistor

The shape and size of surface mount resistors are standardized most manufacturers use the jedec standards. So it would be advisable to add a lot of margin.

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In addition to a resistance value measured in ohms it has a maximum power rating measured in watts.

Wattage resistor. The resistor power rating is sometimes called the resistors wattage rating and is defined as the amount of heat that a resistive element can dissipate for an indefinite period of time without degrading its performance. A 1 watt resistor will be larger than a 14 watt resistor. With carbon composition obsolete and carbon film resistors the physical size of the resistor is proportional to its wattage rating.

This code contains the width and height of the package. P144 watts resistor will be dissipating 144 watts at 12v with 120 milli amps flowing thru it. So is using 2 series resistors of 25 ohms.

So having a resistor with at least double the wattage required would be advisable. Resistors come in different wattage values 18w 14w 12w 1w etc usually printed on them. A reliable high power resistor is a necessary component for technologies that require designs intended to withstand and eventually dissipate a large amount of power.

A resistor is a standard electronic component that has a constant electrical resistance in a circuit. With wirewound and other power resistors the wattage rating is usually stamped on the resistor body. Riedon specializes in optimal designs requiring high power resistive technology.

And also temperature will degrade the capacity of the resistor to handle powerfor example a thin film resistor will handle 80 of power dissipation at 85 degrees celsius and 50 at 100 degrees celsius. Two parallel resistors of say 10 ohms value makes a 5 ohm resistor and the overall power that can be taken is double. Theyll add up to 5 ohms and have exactly the same power rating.

When a circuit does not exceed the power rating the resistor works reliably and without fuss for decades. The size of smd resistors is indicated by a numerical code such as 0603. The power rating for the power resistor needs to be at least 5 watt.

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