Resistor Wattage: What is Power Rating Of A Resistor | WowElectric

Have you ever noticed that, there are smalls resistors and larger resistors of the same value.

Resistor Wattage: What is Power Rating Of A Resistor

Wattage may be more important then resistance. Resistors can range in wattage from nearly zero to tens of thousands of watts. Without looking hard I found resistors are range from 1/8 watt to 80 watts. The rating is always for given conditions, such as the ambient temperature, or when mounted on a heat sink.

You can determine the power in a resistor, by computing the voltage across times the current thru it. Usually a safety factor is also used, so the rating is at least twice the expected power. Such derating helps make reliable circuits.

Power usually doesn't make it onto the schematic. If it does it is only shown for a few exceptional resistors. Usually it is only noted in the bill of materials. If you wish to note it just put the rating followed by W for watts.
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