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Voltage multiplied by current. The difference is normally KVA has a power factor following it i.e., it is used in Ac measurements. KW = Kilo volt * Current. KVA = Kilovolt * Current * power factor. When power factor =1, then KVA = KW. The AC loads have characteristic called Power factor depending on the load whether it is inductive or capacitive. The power factor will be either lagging or leading which are opposite in polarity to each other in simple form.
More about generator ratings For an engine-generator set, the KVA rating is basically determined by the maximum current. The KW rating is determined by the power rating of the engine. A generator set rated 5 KVA, 0.8 pf, the engine would be capable of generating 4 KW. Operating at 5 KVA and 4 KW would be operating at the maximum capability of both the engine and generator. If the power is 4 KW but the pf is less than 0.8, the KVA would exceed the generator rating. If the generator is operating at 5 KVA and the pf is higher than 0.8, the KW would exceed the engine rating. No matter how the relative ratings of the generator and engine are selected, there is only one pf at which the capabilities match.