8. DC/AC. Do the following and be sure to include details discussed in class: a)
ID: 1298978 • Letter: 8
Question
8. DC/AC. Do the following and be sure to include details discussed in class: a) What's a dynamo? How does it differ from a motor and a generator? b) In one to three paragraphs with supporting diagrams, discuss the differences and similarities between a DC generator and an AC generator. Are there any advantages to using one type of generator over the other? 4 c) What purpose does a transformer serve and how does it work? d) What advantages or disadvantages is there to using AC power in transmitting electricity over distances instead of DC power, if any?Explanation / Answer
A dynamo is an electrical generator that produces direct current with the use of a commutator. Dynamos were the first electrical generators capable of delivering power for industry, and the foundation upon which many other later electric-power conversion devices were based, including the electric motor, the alternating-current alternator, and the rotary converter. Today, the simpler alternator dominates large scale power generation, for efficiency, reliability and cost reasons. A dynamo has the disadvantages of a mechanical commutator. Also, converting alternating to direct current using power rectification devices (vacuum tube or more recently solid state) is effective and usually economic.