6781097167

6781097167



Fizika angol nyelven — emelt szint

Azonositó

jel:


Generator and motor

The electric motor of Jedlik Anyos.


When I created the apparatus for electric rotations discussed previously before the years 1827 and 1828 with good results, no similar conceptions con/d be found or read in the jonrnals or works available to me.

Becanse of these circumstances, it was my opinion that I am the inventor of the electric apparatus described and its method of application...

Jedlik Anyos

Explain how a generator creates electric current via doing mechanical work. Sketch a drawing of the system design and explain the theoretical background along with role of Lenz's law. Mention an application for the generator.

Explain the functioning of a type of electric motor of your choice. Present the physical laws and interactions that are reąuired to understand its functioning. In the course of your explanation, sketch a drawing that illustrates the motor's functioning and mention an application for the electric motor.

The whistle sounds


The whistle is a cylindrical tubę closed at the top end and open at the bottom end and is madę of wood, bonę or glass. It has a sharp-edged opening for the mouth under its closed end and has several smaller side-holes along it. If the air is blown towards the sharp edge of the opening for the mouth in an obliąue direction, while the side-holes are all closed, the oscillation with a node at its middle that is generated is the lowest sound for the whistle.

Schirkhuber Móricz: Elmeleti es tapasztalati termeszettan alaprajza (1851)

Review the concept of standing waves and how they are created. Review the most important physical properties of the sound created in a whistle, their relationship, the type of wave created and the factors affecting the pitch of the sound. Explain the properties of the sound created in an open whistle and in a closed whistle, the relationship between the wavelength and the length of the whistle. Explain the role of the harmonics in the forming of the sound of the whistle.

Total

Presentation

18 points

5 points

irasbeli vizsga 1112


9/16


2012. majus 17.




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