The power as a function of lime for a certain load is shown

The power as a function of lime for a certain load is shown in Figure PI-6 for a 12-hour period. Determine the total energy in (a) kWh and (b) joules.

Solution

1-6 Ans) Energy=Power * Time

a) Energy E =(500*4)+(1500*(8-4))+(1000*(12-8))

E=2000+6000+4000=12000 W-h=12 kWh

E=12 kWh

b) 1kWh=3.6*10⁶ Joules

E=12 kWh*3.6*10⁶=43.2*10⁶ J

E=43.2*10⁶ J