a For many purposes it is necessary to change an alternating

Last updated: 6/10/2023

a For many purposes it is necessary to change an alternating voltage from one value to another of greater or smaller value Name the device that can accomplish the above task b Mention any two reasons for energy loss in the above device c Explain how large scale transmission and distribution of electrical energy over long distances is done with the above device d Give reason for the following i At an airport a person is made to walk through the doorway of a metal detector for security reasons If he she carries anything made of metal the metal detector emits a sound On what principle does this detector work ii Why is the use of a c voltage preferred over d c voltage