By Jerry B. Marion (Auth.)
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6 (1 hr) X χ ^^^^ 1 hr ^ 10^ J It is important to understand the distinction between power and energy (or work) , and it is important to understand that kilowatts and kilowatt-hours refer to two different physical quantities. Power is the rate at which work is done or the rate at which energy is used. 2. Notice that the continuous power output of an active human body is limited to a few hundred watts. However, for brief intervals, the power figure can be substantially higher. For example, for the fraction of a second that a high-jumper requires to launch himself off the ground, his body is operating with a power of about 3 kW.
06 1. 17 0. 15 1. 38 144. 33 The Kiplinger Magazine, November ENERGY USAGE IN THE FUTURE The history of the American appetite for energy is one of continual increase. 2 shows that the total energy consumption per year has undergone a 20-fold increase in the last 100 years. During this same period. 2 Consumption of energy in the United States since 1850. 2000 in all forms per year the population has grown by a factor of 5. That is, we now use 4 times as much energy per person as we did in the 1870s.
The electrical power industry plans new generating facilities (which require many years for design and construction) on the basis of the expected requirements in the future. Although it is clearly necessary to plan ahead, it is not prudent to place too much reliance on estimates that carry far into the future. 4) is a result of the fact that the late 1950s and early 1960s were years of exceptional economic growth. If we use this doubling time to estimate the number of automobiles in this country in the year 2000, we come to the 44 3 Energy Consumption—Today and the Future absurd conclusion that every person will own two or three automobiles.