How to Calculate Case Fan Amps
To calculate the amount of current, in amperes or "amps," you must solve for the relationship I=P/V where "I" represents the current, "P" stands for the power (in watts) and "V" stands for voltage (in volts). Since a case fan in your computer converts electrical energy to mechanical energy, it must utilize a complete electrical circuit. Since manufacturers of the case fans typically list the power and voltage information on the back or side sticker of the case fan, calcuatling the case fan amps is simple.
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Instructions
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Find the total amount of power, in watts, that the case fan produces by looking for the sticker on the back or side of the device. The number is usually followed by the abbreviation for watts, which is "W."
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Locate the voltage of the case fan, which can also be found on the sticker on the back or side of the device. Look for a number followed by the abbreviation for volts, "V." For most average case fans, the voltage is around 120V to 160V.
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Calculate the case fan current, in amps, by dividing the power by the voltage. For example, a 160-V case fan which 720-W of power will have a current of 4.5 A.
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