ENSU 310: Online Snodgrass Name: ________________________
Each day the Sun bathes the Earth with radiant energy (mainly coming in the form of visible
light). This energy creates and drives our weather and it can be used to generate electricity. To
understand how much energy the Sun provides, let’s compare its energy to the total amount of
primary energy consumed by of all of mankind in 2009.
Below is a diagram that illustrates the concept of the solar constant – or the power per unit area
the Earth receives from the sun. Use this diagram and the information provided to answer the
question below. Joule = SI unit for energy
1 second = SI unit for time (86400 seconds in a day)
1 watt = 1 Js-1 (Joules per second) = power = energy over time
1 kilowatt-hour = kW-h = power * time = energy = 3,600,000 J Problem: First, calculate the amount of energy coming from the Sun each day that is received on
the daylight side of the Earth (same as the cross-sectional area of the Earth). In 2009, the world
consumed 139,000 TW-h (terawatt-hours) of primary energy (all sources). Second, convert the
energy consumed by mankind in 2009 from TW-h to Joules. Finally, compare the amount of
energy provided to the Earth from the Sun in one day to the amount of energy consumed in an
entire year by humans. (SHOW ALL YOUR WORK)
*** Be very careful with units***
Work in groups if you want to. Compare your approach to solving this problem with your class mates.

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