Every covering should be loose enough so you can still operate the remote control buttons through it.
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When current flows within a wire, it generates an electromagnetic field around the wire. This is possible because inside transmitters are wires that allow negatively charged particles, called electrons, to flow through them, which makes an electrical current. Have you ever noticed that you lose reception on a car radio or cell phone when you drive into a tunnel or an underground parking garage? What materials block the radio waves, and which ones allow the waves to easily pass through?Ī transmitting antenna, or transmitter, generates and sends out radio waves thanks to a specific electrical current. Some materials can block, or interfere with, radio waves. To send information using radio waves, a transmitting antenna sends out a radio wave at a certain frequency (which can tell us the size of the wave), and this is picked up by a receiving antenna. Radio waves are not harmful but are in fact extremely useful for communicating across long distances. Radio waves are a type of electromagnetic radiation, a kind of energy that also includes visible light. Some of these waves are called radio waves.
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Have you ever wondered how a radio can receive music and news broadcasts over thin air? Radios, as well as radio-controlled cars and cell phones, all receive information via invisible waves.