farewhe.blogg.se - Solved problems from maximum power transfer theorem pdf

For transmission of audio and video signals, the required frequency range of radio waves is between 100 KHz and 100 MHz.

For Example domestic power in India is supplied at a frequency of 50 Hz. This enables us to utilize the whole range of electromagnetic spectrum for one purpose or the other. Also the frequency of the induced emf can be altered by changing the speed of the coil.

The significance of an alternating emf is that it can be changed to lower or higher voltages conveniently and efficiently using a transformer. Since the emf induced in the coil varies in magnitude and direction periodically, it is called an alternating emf.

Concepts of Physics by HC Verma for JEEĪs we have seen earlier a rotating coil in a magnetic field, induces an alternating emf and hence an alternating current.

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