Molly Ayala
Wireless power transfer is a technology that allows electrical energy to be transmitted from a power source to a device without the need for physical connectors or wires. This technology can be used to charge devices such as smartphones, electric toothbrushes, electric vehicles, and medical devices. One method of wireless power transfer is inductive coupling, which uses electromagnetic fields to transfer power between two coils - a transmitter coil in the charging pad and a receiver coil in the device. Another method is resonant inductive coupling, which uses resonance to improve power transfer efficiency over greater distances. Nikola Tesla experimented with wireless power transfer in the late 1800s, and more recently, researchers at Sejong University in South Korea have developed a charging system that uses infrared light and a receiver to transfer power to electronics up to 100 feet away. Additionally, light can be converted into electricity using solar panels, and fiber optic devices can translate light pulses into electrical signals. Light-emitting diodes (LEDs) are also a significant innovation, with the ability to emit light when current flows through them, producing infrared, visible, or UV light.
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What You'll Learn
Incandescent light bulbs
An incandescent light bulb is an electric light that produces light by heating a filament to incandescence. Invented by Humphry Davy around 1805, the carbon arc was the first practical electric light. It was used commercially beginning in the 1870s for large building and street lighting. However, it was superseded in the early 20th century by the incandescent light bulb.
Despite their widespread use, incandescent bulbs are much less efficient than other types of electric lighting. Less than 5% of the energy they consume is converted into visible light, while the rest is released as heat. Incandescent bulbs also have shorter lifetimes compared to other types of lighting, with around 1,000 hours for home light bulbs, compared to 10,000 hours for compact fluorescents and 20,000-30,000 hours for lighting LEDs.
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Fluorescent light bulbs
Fluorescent bulbs are a more complex technology than incandescent bulbs, which simply heat a filament wire with electricity to produce light. Fluorescent bulbs use electricity to excite gas atoms, which then produce light through radiative de-excitation. This process allows for the production of specific colours of light, depending on the type of gas atoms used.
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Light-emitting diodes (LEDs)
A light-emitting diode (LED) is a semiconductor device that emits light when an electric current flows through it. LEDs are transducers of electricity into light. They are a type of semiconductor that combines a P-type semiconductor (larger hole concentration) with an N-type semiconductor (larger electron concentration).
When a sufficient forward voltage is applied, the electrons and electron holes recombine at the P-N junction, releasing energy in the form of photons. The wavelength of the light depends on the energy band gap of the semiconductors used. The color of the light corresponds to the energy of the photons, which is determined by the energy required for electrons to cross the band gap.
White light can be obtained by using multiple semiconductors or a layer of light-emitting phosphor on the semiconductor device. One way to produce white light is to use individual LEDs that emit the three primary colors—red, green, and blue—and then mix the colors to form white light. Another method, which is more commonly used, is to use a phosphor material to convert monochromatic light from a blue or UV LED into broad-spectrum white light, similar to a fluorescent lamp.
LEDs have several advantages over traditional light sources, including low power consumption, low heat generation, and instantaneous on/off control. They also have a relatively low cost of manufacture and long life, although the lifetime of an LED lamp is strongly dependent on its operating temperature.
There are also LEDs that emit light outside of the normal visible spectrum, such as infrared and ultraviolet LEDs. Infrared LEDs are commonly used in remote-control circuits, while ultraviolet LEDs can be used for disinfection and sterilization, counterfeit detection, and making certain materials fluoresce.
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Laser power transmission
Wireless power transmission technology has become increasingly popular in recent years, with laser power transmission (LPT) gaining significant attention. LPT is a wireless power transfer method that employs laser beams to transmit power. This technology has the potential to revolutionize energy transfer by providing contactless transmission, high efficiency, and enhanced safety.
LPT can be used to wirelessly supply power to mobile devices, robots, and aerospace vehicles, improving their reliability and lifespan. For example, PowerLight Technologies, an American engineering firm, has successfully demonstrated the transfer of 400 watts of power over 1 kilometer using laser power beaming.
The process of LPT involves converting electricity into a laser beam that is received and concentrated onto photovoltaic cells (solar cells). These cells then convert the light energy back into electricity. This mechanism is known as power beaming, as the power is beamed at a receiver that can convert it into electrical energy.
One advantage of LPT is the ability to transmit power over large distances without a reduction in power as the distance from the transmitter to the receiver increases. This is achieved through collimated monochromatic wavefront propagation, which allows for a narrow beam cross-section area. Additionally, LPT offers a compact size, as solid-state lasers can fit into small products.
However, there are also some challenges and limitations associated with LPT. One issue is the low power conversion efficiency of current high-power, continuous-wave lasers, which can be less than 25%. Additionally, the intense beam of LPT can pose health and safety hazards. Furthermore, LPT requires that the power transmitter and receiver are in the line of sight, with no intermediate obstacles, as the wave cannot pass through them.
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Wireless power transmission
Capacitive coupling, also known as electric coupling, utilizes electric fields to transmit power between two electrodes (anode and cathode). This method has been studied for its potential in dynamic wireless power transfer for vehicles, although it has been found to cause electromagnetic interference at a significant radius.
Optical beaming, a more recent development, uses lasers to transmit power. In this method, electricity is converted into a laser beam that is received and concentrated onto photovoltaic cells (solar cells), which convert the light back into electricity. This mechanism is known as power beaming, and it offers advantages such as narrow beam cross-section areas for transmission over large distances, compact size, and high efficiency. A proof-of-concept project by Ericsson and PowerLight Technologies demonstrated the use of optical beaming to power a portable 5G base station.
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Frequently asked questions
Electricity is a set of physical phenomena associated with the presence and motion of matter possessing an electric charge. It is related to magnetism and is part of the phenomenon of electromagnetism.
The sun and other stars are natural sources of light, with nuclear energy as their source of energy. Lightning is another natural source, with electrical energy as its source.
Incandescent light bulbs, fluorescent light bulbs, and discharge tubes are some examples of man-made sources of light. The carbon arc lamp, invented by Humphry Davy around 1805, was the first practical electric light.
LEDs are semiconductor devices that emit light when an electric current flows through them. The recombination of electrons and electron holes in the semiconductor produces light through a process called electroluminescence.
Wireless power transfer involves transmitting electrical energy without wires, using electromagnetic fields. Nikola Tesla experimented with wireless power transfer and demonstrated lighting incandescent light bulbs wirelessly. Wireless power transfer has potential applications in lighting and power distribution.
