Since the light bulb is purely resistive (has very little reactance), you can just measure the RMS voltage across the light bulb (usually 120 V) and the RMS current going through the light bulb. Power (P) is:
P = VRMS x IRMS
watts
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the 3 types are......... power outlet a light bulb thats all i can think of
Thsi depends on the light bulb specification. For example if you buy a standard 60W light bulb from your supmarket then this will consume 0.06kilowatts. Its simple just divide the wattage stated on the light bulb by 1000 to give you the kilowatts
As a light bulb
Shining light bulb
It is 0.2325