Many factors have to be taken into account to achieve a successful rocket launch, maintain a stable orbit and return to Earth. Future space travel and exploration will entail a combination of new technologies based on current and emerging knowledge. Current and emerging understanding about time and space has been dependent upon earlier models of the transmission of light. 9.3 Motors and Generators Contextual Outline Electricity is a convenient and flexible form of energy. It can be generated and distributed with comparative ease, and most importantly, it can be readily converted into other forms of energy such as heat, light, sound or mechanical energy.
Electricity is a key element in the development of industrialised nations.
The design of a motor for an electrical appliance requires consideration of whether it will run at a set speed, how much power it must supply, whether it will be powered by AC or DC and what reliability is required. The essentials of an electric motor are the supply of electrical energy to a coil in a magnetic field causing it to rotate. The generation of large quantities of electrical power requires relative motion between a magnetic field and a coil. In the generator, mechanical energy is being converted into electrical energy while the opposite occurs in the electric motor. Once generated, electricity must be distributed over long distances from the power station to cities and towns.