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It depends on the size of the heat sink. Heat sinks are available in many sizes, the smallest being suitable for fitting to a single transistor.

A heat sink is rated by the temperature rise in degrees C per watt of dissipated power. The smallest heat sinks are rated at about 20 degrees per watt while larger ones provide 1 degree or less per watt.

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10y ago
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9y ago

The wattage rating of a heat sink is usually expressed in degrees per watt, meaning the temperature rise for a given continuous power in watts.

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Q: How many watts per hour with a heatsink attached?
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