Step-by-step explanation:
number 1
power = iv = 10×3 = 30 watt
number 2
power in R1
P=V²/R1
p=15²/10
p=22.5
power in R2
p=15²/5
p=45
number 3
energy= power ×time. time changed from hour to sec
energy=200 ×10800
energy= 2,160,000 watt sec
or in hours
energy= 200× 3
energy= 600 watt hour
number 4
from energy formula we obtained that
power=energy/ time
so
power=1000/30
power = 33.3 joule per second