Television

Definition

A television is an electronic device that receives electromagnetic waves and converts them into audio and visual signals. It primarily uses radio frequency waves, a part of the electromagnetic spectrum, to broadcast content.

5 Must Know Facts For Your Next Test

1. Televisions operate by receiving and decoding radio frequency (RF) waves, which are part of the electromagnetic spectrum.
2. The invention of television is heavily reliant on advancements in understanding electromagnetic wave propagation and signal modulation.
3. Television signals can be transmitted via different media such as cable, satellite, or over-the-air broadcasts using RF waves.
4. The resolution and quality of a television picture are influenced by the wavelength and frequency of the transmitted electromagnetic waves.
5. Digital television has largely replaced analog systems, using digital signals that provide better image and sound quality through efficient use of the electromagnetic spectrum.

Review Questions

• How does a television receive and convert electromagnetic waves into audio-visual signals?
• What part of the electromagnetic spectrum do television broadcast signals belong to?
• Why did digital television replace analog systems in terms of electromagnetic wave usage?

Related terms

Electromagnetic Spectrum:

The range of all types of electromagnetic radiation, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Radio Frequency (RF): A range within the electromagnetic spectrum typically used for communications such as broadcasting television signals. It ranges from about 3 kHz to 300 GHz.

Signal Modulation: The process of varying a carrier signal in order to transmit data. In televisions, amplitude modulation (AM) or frequency modulation (FM) is commonly used.