k is 1000
V is volts
A is amps
basic algebra kVA = (V * A)/1000
120 Volt with 20 Amp would be: (120 * 20)/1000 = 2.4 kVA
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1 VA (VOLT AMPERE)= 1 WATT
1 k(1000) VA = 1000 watts
a 100 watt light bulb would use 1 KVA hours in 10 hours.
5kw = 6.25 kva becoz kva = kw/ pf if we take pf is o.8
A kva load in the text that you use it is the same as a wattage load. To find your answer just total up all of your appliance wattage's, portable and hard wired, in the unit and this will give you an idea of what you have for a load.
Rating for DG set and any of electrical machines is calculated in KVA. KVA is calculated as KW/pf. One can calculate the required KVA for DG set with this formulation: (KW/pf)/load rate. For example KW=110, pf=0.8 and one loads the DG at 75%, so KVA= (110/0.8)/0.75=185 KVA.
For normal power factors (pf=80%), you have 0.8 kW for every kva. In general however, kW = pf x kVA. Where pf is the power factor, it is the cosine of the angular difference between the voltage and the current of a circuit in alternating current circuits.
transformer action doesn't depend on power factor that is why we indicate its rating in KVA