1. The problem statement, all variables and given/known data Question: Lake Mead is formed by the Hoover Dam, and while it actually changes in area and volume, consider it has an average area of 100,000 acres. Assume that 250 W/m^2 of sunlight falls on Lake Mead, how much electricity could be produced if this lake area was covered by solar voltaic cells that convert sunlight directly to electricity with 15% efficiency? 2. Relevant equations 1 Acre = 4046.85642 Square Meter 3. The attempt at a solution I am trying to find the amount of electricity that could be produced in this area, so I know that the final answer needs to be in Watts. This means I need to find a way to cancel out the m^2 in a conversion. Here is the conversion I attempted to cancel out the acres and square meters: (100,000 acres)*(4046.85642 m^2)*(250W) = 1.012*10^11W That number is assuming 100% efficiency. So to account for the 15% efficiency of the solar panels: (1.012*10^11)/.15 = 6.74*10^11W I don't feel very confident in this answer, but I'm not quite sure what I am missing or what I am doing wrong. Any nudges in the right direction would be greatly appreciated!