150 divided by 20 = 7.5 & as you can't buy half a lamp it's 7 with a bit to spare!,
VA is as KB says Volts X amps = watts for a purely resistive load, if inductive such as motors transformers ect, then power factor reduces actual power available which is why gen. sets have 2 ratings watts & VA.
Makers always advertise in VA as numbers more impressive, a bit like Americam horse power, only pony power to our way of measuring!!!
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