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 you turn on a CD player, you are using this form of energy to produce sound energy. At a power plant nearby, matter is changed into energy to produce this form of energy. Eating a healthy breakfast provides this form of energy, which is turned into mechanical and thermal energy as you play, study, and move. Plug in a fan to a source of electrical energy. The electrical energy is transformed into this form to move the fan blades. Plug in a lamp into an electrical socket and you turn electrical energy into this form of energy. Radiant energy from the sun is turned into this form when plants undergo photosynthesis.