How has the use of energy by humans changed over the last 100 years? What are some uses of energy today that would have been unthought of 200 years ago? While the use of electricity is properly...

How has the use of energy by humans changed over the last 100 years? What are some uses of energy today that would have been unthought of 200 years ago?

While the use of electricity is properly considered work, the energy transfer involved with electrical work may be thought of as a heat input. When might a heat transfer interpretation of the energy transfer associated with electrical work be reasonable?