What fraction of the total rate of U.S. electricity production in 1980 does 2.67 x 10^8 W correspond to? Here are some facts that go along with the problem:
Since there are 3.15 x 10^7 seconds in a year, electric energy would be produced at 2.67 x 10^8 W. This is roughly 1/4 the power output from 1 typical, modern, nuclear, or coal-fired electric power plant. Electricity is produced at a rate of 8.4 x 10^15 J/yr.
1 Joule = 1 watt * 1 Second
Electric Energy/Year = 8.4*10^15 ...
This provides an example of connecting watts and joules.