Question

A current of 6A is drawn from a 120V line. What power is being developed?How much energy in joule and in kwt is expended if the current is drawn steadily for one week.

Answer 1

Power= Current * Voltage
Power=6 A* 120 V=720 watts
If the current is drawn for one week
Time T= 7*24*3600 seconds= 604800 seconds
Energy= Power*Time= 720*604800 Joules or 435,456,000 Joules
In kwt= 435,456,000/1000= 435456 kwt

Answer 2

use power formula,
P=VI
P=6*120
P=720W

then, convert time in seconds from week.
t=7*24*3600=604800s

E=P*t
E=720*604800
E=435456000W

then, convert energy in KW (move point three decimal towards left)
E=435456KW

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