Historic time capsule found at Washington Monument. Before you go, we thought you'd like these... BALTIMORE (WBAL) -A piece of history has been discovered in Baltimore. The original cornerstone of the Washington Monument in Baltimore, thought to be long lost, was discovered last week while crews dug for a sewage tank.
We divide our energy use among four economic sectors: residential, commercial, transportation, and industrial. Heating and cooling our homes, lighting office buildings, driving cars and moving freight, and manufacturing the products we rely on in our daily lives are all functions that require energy.
When we use energy, it. doesnât disappear. We change it from one form of. energy into another. A car engine burns gasoline, converting the chemical. energy in gasoline into mechanical energy. Solar cells. change radiant energy into electrical energy. Energy. changes form, but the total amount of energy in the. universe stays the same.