Physics

Problem

Answer the following questions about the practical unit of electrical energy, the kilowatt-hour. a. (i) Define one kilowatt-hour. b. (ii) Show that

1\,\text{kWh}=3.6\times10^{6}\,\text{J}

. c. (iii) Explain why the kilowatt-hour is preferred over the joule as a commercial unit of electrical energy.