Sizes of Power

We've looked before at approximate sizes of heat transfer coefficients and heat fluxes, and in this post we'll extend that to look at approximate comparative sizes of power—both generation and use.  This chart shows sizes from the power generated by the largest hydroelectric plant in the world to the power available from a tiny hearing aid battery.  Note that the scale is logarithmic: each line represents a factor of 10 increase over the preceding line.  The scale is shown in both Watts, which is a common unit of power for electricity, and in horsepower which is a common unit of power for engines.