Volt-Amps are called the "apparent power" and are the product of the voltage applied to the equipment times the current drawn by the equipment. The VA rating is used for sizing wiring and circuit breakers. The VA and Watt ratings for some types of electrical loads, like incandescent light bulbs, are identical. However, for computer equipment the Watt and VA ratings can differ significantly, with the VA rating always being equal to or larger than the Watt rating. The ratio of the Watt to VA rating is called the "Power Factor" (PF) and is expressed either as a number (i.e. 0.7) or a percentage (i.e. 70%). Unfortunately, PF value is practically never stated in appliance's spec sheet. Old computers used to have PF = 0.6-0.65. Normally, single-phase generators for homes are usually rated for lo
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| - Volt-Amps are called the "apparent power" and are the product of the voltage applied to the equipment times the current drawn by the equipment. The VA rating is used for sizing wiring and circuit breakers. The VA and Watt ratings for some types of electrical loads, like incandescent light bulbs, are identical. However, for computer equipment the Watt and VA ratings can differ significantly, with the VA rating always being equal to or larger than the Watt rating. The ratio of the Watt to VA rating is called the "Power Factor" (PF) and is expressed either as a number (i.e. 0.7) or a percentage (i.e. 70%). Unfortunately, PF value is practically never stated in appliance's spec sheet. Old computers used to have PF = 0.6-0.65. Normally, single-phase generators for homes are usually rated for lo
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| - Volt-Amps are called the "apparent power" and are the product of the voltage applied to the equipment times the current drawn by the equipment. The VA rating is used for sizing wiring and circuit breakers. The VA and Watt ratings for some types of electrical loads, like incandescent light bulbs, are identical. However, for computer equipment the Watt and VA ratings can differ significantly, with the VA rating always being equal to or larger than the Watt rating. The ratio of the Watt to VA rating is called the "Power Factor" (PF) and is expressed either as a number (i.e. 0.7) or a percentage (i.e. 70%). Unfortunately, PF value is practically never stated in appliance's spec sheet. Old computers used to have PF = 0.6-0.65. Normally, single-phase generators for homes are usually rated for loads with PF = 1, so their wattage and VA ratings are the same. Since typical appliances have PF=0.6-0.8, their VA power consumption is 25-60% greater than their wattage.
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