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How does an antenna convert electromagnetic waves into a current?
Wiki User
∙ 13y ago
According to Faraday's law: "When current is passed through a conductor, an EM field is produced surrounding it." As an antenna contains one or more conductors, the terminals of which are connected to some voltage, when this voltage at the terminals is applied, it produces/induces the alternating current which radiates the elements in the electromagnetic field. (Transmission)
The reverse of this occurs in reception; where the electromagnetic field from another source induces an alternating current in the antenna, and a corresponding voltage at the antenna's terminals.
Wiki User
∙ 13y ago
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Is it possible to transmit electricity as electromagnetic waves?
Well, when you transmit something as an electromagnetic wave, it is no longer an electric current, since an electromagnetic wave doesn't involve movement of charges. However, you can convert electrical energy into an electromagnetic wave, transfer that, and then convert it back to an electric current at the receiving end.
How antenna radiate em waves?
The underlying electromagnetic radiation mechanism is illustrated by evaluating the scattered radiated field and its effects on the aperture efficiency by considering the theoretical limits of a radiating conical horn with infinite length
What is the transfer of energy as electromagnetic waves?
first of all electromagnetic waves are energy waves. and we call electromagnetic waves RADIATION.
Which types of these waves is not a mechanical wave?
Examples of mechanical waves are waves in the ocean and sound waves from devices like mouths, trombones, and radios. Electromagnetic waves like sunshine and X-rays are not mechanical waves because matter is not doing the waving.
What Waves that can travel through a vacuum?
Electromagnetic waves.
How do you produce electricity from electromagnetic waves?
Current flows through any conductor when electromagnetic waves fly past it. That's how a radio antenna works.
What is the importance of antenna in a wireless communication system?
For wireless communication systems, the antenna is one of the most critical components. A good design of the antenna can relax system requirements and improve overall system performance. An antenna is the system component that is designed to radiate or receive electromagnetic waves. In other words, the antenna is the electromagnetic transducer which is used to convert, in the transmitting mode, guided waves within a transmission line to radiated free-space waves or to convert, in the receiving mode, free-space waves to guided waves.
Is it possible to transmit electricity as electromagnetic waves?
Well, when you transmit something as an electromagnetic wave, it is no longer an electric current, since an electromagnetic wave doesn't involve movement of charges. However, you can convert electrical energy into an electromagnetic wave, transfer that, and then convert it back to an electric current at the receiving end.
Which part of your radio receivers the electromagnetic waves sent out from a radio station?
The antenna does that.
What is the nature of an current?
is a flow of electromagnetic waves that have a potential
Is the radio a source of the waves?
The source is the RF current in the transmitting antenna.
How is magnetism used in a car?
Any solenoid in your car is an electromagnetic device, including the alternator. The car antenna also receives electromagnetic waves to get radio.
What is the difference between electrmagnetic waves and lasers?
Electromagnetic waves are generated through frequency oscillations which usually involve a coil of wire or in an extension such as a transmitting antenna. Lasers are light, formed in a coherent beam and generally don't exhibit electromagnetic waves.
Are you really transmitting voltage in amplitude modulation?
Assuming you have the output of an AM modulated voltage hooked up to a properly matched antenna, you're really transmitting electromagnetic waves. An electromagnetic wave, when intercepted by another antenna that is somewhat matched to the frequencies being used, induces a (tiny) voltage on that antenna that can be rectified, amplified, and turned back into sound waves on the receiving end.
How can radio waves convers to electrical energy?
An antenna picks up radio waves and converts them to electrical current
How does a television receive wirelessly transmitted electromagnetic waves and convert them into acoustic and light energy?
Wireless electromagnetic waves are collected by a TV Antenna,; they are amplified by and transformed into sound by a speaker (motor action) and displayed by a TV Screen (electricity to light converter). All these things are powered by an electrical power source, a battery or power cord to the electric company.
What changes sound waves into electrical signals sends them over a distance and changes them back into sound waves?
Changing sound waves into electromagnetic signals is the basic function of a microphone. The electromagnetic signal may be sent through a wire or broadcast as an electromagnetic wave such as a radio wave.Sound waves are gathered by a thin material that vibrates when the sound hits it (microphone) - The material has a magnet attached on the back surrounded by a coil of wire. The magnet vibrates inside the coil and creates a voltage/current in the coil. Wires from the coil are connected to an antenna which is a special shaped conductor. The current moving up & down in the antenna creates EM waves which radiate out into space. This is the basic idea. The actual circuit will have an amplifier to increase the electricity, from the coil, before sending it to the antenna.
