Maxwell's equations predicted that oscillating electric currents should radiate electromagnetic waves that travel at the speed of light. Heinrich Hertz discovered these Hertzian waves through electrical oscillations in a conductor, with wavelengths from millimeters to kilometers. EM waves for communication are produced using a parallel LC circuit, where the capacitor and inductor cause the electric current to oscillate, generating the waves. Radio and TV waves have the longest wavelengths and lowest frequencies in the electromagnetic spectrum and are produced by oscillating electricity in an aerial.

3. Producing Electromagnetic Waves

4. Producing Electromagnetic Waves

5. Producing Electromagnetic Waves
Maxwell’s electromagnetic equations
states that an oscillating electric current
should be capable of radiating energy in the
form of a wave known as electromagnetic
waves (EM waves) that would travel as fast
as the speed of light.

6. Producing Electromagnetic Waves

7. Producing Electromagnetic Waves
Heinrich Hertz

8. Producing Electromagnetic Waves
discovered Hertzian wave – an
electromagnetic radiation produced
by
electrical
oscillation
in
a
conductor, of wavelengths ranging
from the order of millimetres to
kilometres.

9. Producing Electromagnetic Waves

10. Producing Electromagnetic Waves

11. Producing Electromagnetic Waves

12. How Electromagnetic Waves are Created
An EM wave used for communication
purposes is made by using a coil and a
capacitor in a parallel circuit.

13. How Electromagnetic Waves are Created
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14. How Electromagnetic Waves are Created

15. How Electromagnetic Waves are Created

16. How Electromagnetic Waves are Created

17. How Electromagnetic Waves are Created

20. The Electromagnetic Spectrum
Radio and TV waves
are waves that have the longest
wavelengths and the lowest frequencies
in the electromagnetic spectrum. They
can be produced by making electricity
oscillate in an aerial.

22. The Electromagnetic Spectrum

24. The Electromagnetic Spectrum

26. The Electromagnetic Spectrum
Visible waves
are waves that are visible to
the naked eye; also known as
light waves.

28. The Electromagnetic Spectrum

31. The Electromagnetic Spectrum

33. The Electromagnetic Spectrum