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With carbon composition obsolete and carbon film resistors the physical size of the resistor is proportional to its wattage rating. As the dissipated resistor power rating is linked to their physical size a 14 0250w resistor is physically smaller than a 1w resistor and resistors that are of the same ohmic value are also available in different power or wattage ratings. What Is The Power Rating Of A Resistor Different Types Of Resistors How To Identify The Resistor Wattage The Importance Of Wattage In Resistors Urdu Hindi So it would be advisable to add a lot of margin. How to size a resistor wattage . Place the resistor on the outline to make sure they match. You can determine a resistors wattage with a size chart. All you need to worry about is the resistance value and how much power it can take. Plug in value into ohms law formula. This code ...