טקסט Storyboard
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- Know
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- First is Orsted. In 1820, Hans Christian Orsted, a physicist from Denmark, began to discover the relationship between electricity and magnetism. He was giving a lecture in class and set up a wire with a current to demonstrate the heating effect of current. But he accidentally brought the compass close to the wire and noticed that the middle twitched or moved when the wire was connected to the battery. Since the compass needle is made of magnetism, he noticed that the electric current had a magnetic effect and he concluded that an electric current can create a magnetic field.This discovery by Orsted was quite groundbreaking because no one ever thought that there was a connection between electricity and magnetism until his discovery. This served as a springboard for other scientists to conduct their own experiments to establish the relationship between electricity and magnetism. So that's Orsted and he discovered
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- Good morning class now we will discussing the five people with very important contributions in electromagnetics. How important are they? We will find out.
- Now, let's start our topic
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- Heinrich Hertz, a German physicist, applied Maxwell's theories to the production and reception of radio waves. The unit of frequency of a radio wave -- one cycle per second -- is named the hertz, in honor of Heinrich Hertz.
- With this oscillator, Hertz solved two problems. First, timing Maxwell's waves. He had demonstrated, in the concrete, what Maxwell had only theorized - that the velocity of radio waves was equal to the velocity of light! (This proved that radio waves were a form of light!) Second, Hertz found out how to make the electric and magnetic fields detach themselves from wires and go free as Maxwell's waves.
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- Sir, how about Heinrich Hertz?
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- That's for today. Goodbye class we will have short quiz tomorrow
- Goodbye sir, see you tomorrow
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- Hertz proved the existence of radio waves in the late 1880s. He used two rods to serve as a receiver and a spark gap as the receiving antennae. Where the waves were picked up, a spark would jump. Hertz showed in his experiments that these signals possessed all of the properties of electromagnetic waves.
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