Faraday\'s law: Faraday\'s law is a concept that has a surprisingly large number
ID: 1626104 • Letter: F
Question
Faraday's law: Faraday's law is a concept that has a surprisingly large number of applications in today's society. Describe at least three of such. Mechanical waves: From the lab, you probably got the impression that the concept of overtones is an important concept for musical instruments. Pick your favorite instrument and describe how the concept of overtones and resonant frequencies influence the sounds they make. Bonus: We can probably name at least one monotonous professor or GSI that we have encountered in our lives. Can you think of how we can use the equipment in the Mechanical waves lab to see just how monotonous they are?Explanation / Answer
Faraday's Law application :
1) TRANSFORMER : A transformer is made of two coils wrapped around an iron core. An alternating emf source E1 is applied to one of the coils (the primary) which has N1 turns.
The current I1 due to E1 creates a changing magnetic eld inside the iron core, which gives rise to a changing ux the secondary coil (with N2 turns in it). By Faraday's Law, an alternating emf E2 is induced in the secondary coil, producing a current I2 in it.
2) AC GENERATOR : Generators and motors operate on the principle of electromagnetic induction. An alternating-current (AC) generator converts mechanical energy into electrical energy. The generator is essentially a coil of many turns that is made to rotate in the presence of a magnetic eld. The energy required to rotate the coil comes from an outside source (e.g. falling water in a hydroelectric power plant). A rotating coil results in a changing magnetic ux and therefore induced a current in the coil.
3) A direct-current (DC) generator works in the same way as an AC generator, except that the rotating coil is connected to an external circuit by means of a split ring called a commutator. The commutator always ensures that the induced emf always has the same polarity, giving rise to a direct current.
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