Write the data down. This will help you solve the question:
I = 15 A
V = 240 V
t = 1.2 h
The power output of the dryer is:
P = I x V
P = 15 x 240
P = 3,600 W
Convert the time in seconds:
T = 1.2 h x 60 minutes x 60 seconds = 4,320 seconds
The energy cost is:
E = P x T
E = 3,600 x (4,320)
E = 15,552,000 J
Or using scientific notation we get:
