Answer / wareagle

normal amperage = 1000/200 = 5 amps
therefore R = E/I 200/5 = 40 ohms
heater in series resistance = 80 ohms
voltage = 100 volts
amps = 100/80 = 1.25 amps
watts = VA = 100 x 1.25 = 125 watts

Active power= VI COS FI But incase of leading power factor ( more than unity), may we use other formula ? because the cos fi (value of cos thita) should not be grater than one.

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