ABSTRACT

This chapter discusses the SI unit of measurement for each of the following: energy, work, heat and power and explains the claimed advantages of smart energy meters compared with conventional energy meters. It describes the relationship between electrical energy and heat and explores problem on work and heat. 'Joule heating', which is also known as 'resistance heating' or 'ohmic heating', describes the process which results in an increase in a conductor's temperature due to an electric current. Electrical appliances, such as incandescent lamps, are required to have the rated power at which they are designed to operate displayed. The rated power is always shown together with the rated voltage, because an appliance will only develop its rated power at its rated voltage. The difference between the work done on a mass, and the heat transfer from that mass represents the change in internal energy of that mass.