Electrical power engineers are involved in a wide variety of technology ranging from huge global positioning systems that can pinpoint the location of a moving vehicle to gigantic electrical power generators. These engineers are responsible for designing, developing, testing as well supervising the production of electrical and electronic equipment and machinery. Electric motors, controls of machinery, lights and wiring in building complexes, vehicles, aircrafts, power generations, control and transmission devices used by electric utilities are all examples of equipment built by these engineers. Electrical power engineers may choose to specialize in various areas like power generation, transmission and distribution, manufacture of electrical equipment or one particular specialty within these areas. These engineers are involved in designing new products, writing requirements for their performance, as well as developing maintenance schedules and charts. Testing equipment and machinery, solving operations problems, estimating time and cost of electrical and electronic products also come under their responsibility.