Flashlights

The invention of the solar powered flashlight is attributed to Dr. Bill Yerkes, who developed the technology in the 1970s. By integrating solar panels with rechargeable batteries, Yerkes created a sustainable and convenient source of light that does not rely on traditional batteries.

All Fenix lights are made in China, but they are Mil-Spec and the quality control on them is great.

Well it won't as light can't turn only go straight from its source.

It almost could if you used fiber optics, and then if you used fiber optic cable the loss in the cable would have the light completely gone long before the light made it around the world.

But the math Speed of light = 299,792,458 METERS PER SECOND

Circumference of the Earth = 40075.16 km

Math MPS to KMPS 299792458 / 1000 = 299,792.458 Kilometers per second

40075.16 km / 299792.458 kmps = .1336 seconds

Yes, although probably not the kind you're thinking about. Microwaves use electromagnetic radiation to heat food. If the microwave is properly constructed and not damaged, none of that radiation escapes.

American inventor Clayton Harris developed the hand-crank flashlight in the late 19th century. The hand crank allowed users to generate electricity manually to power the flashlight, offering a reliable lighting solution without the need for batteries.

Yes, flashlights were available in the 1950s. They were commonly used as portable light sources powered by batteries or hand-crank mechanisms, similar to how they are used today.

The first flashlight was invented by British inventor David Misell in 1899. He patented the design in the United States and produced the first flashlight using a handcrafted tube and incandescent light bulb.

The first practical flashlight was invented by British inventor David Misell in 1899. It used a dry cell battery and an incandescent light bulb.

The flashlight was invented in the late 19th century by British inventor David Misell, who patented the first dry cell battery-powered handheld electric device in 1899. The invention revolutionized portable lighting by providing a convenient and portable source of illumination.

Although a relatively simple device, the flashlight was not invented until the late 19th century, because it depended upon the earlier invention of the electric battery (1800) and incandescent light bulb (1879). On 10 January 1899, American Electrical Novelty and Manufacturing Company obtained U.S. Patent No. 617,592 (filed 12 March 1898) from David Misell, an inventor. This "electric device" designed by Misell was powered by "D" batteries laid front to back in a paper tube with the light bulb and a rough brass reflector at the end. The New Yorker magazine reported in 1947 that Joshua Lionel Cowen, of Lionel toy-train fame, invented the flashlight. The magazine article says that it was a slender battery in a metal tube. On one end of the tube there was a light bulb and the other end had an on-off switch. He used these "flash lights" to illuminate potted flowers. Frustrated by unresolved mechanical problems in getting them to light properly, Cowen sold the invention to Hubert, who then distributed the electrified flowerpots as novelties through his store. The novelty company owned by Conrad Hubert donated some of the tubular models (Misell's patent) to the New York City police, who responded favorably to them. Hubet ultimately turned this into the Eveready flashlight, which built a $6,000,000 fortune. These early flashlights ran on zinc--carbon batteries, which were incapable of providing a steady source of electric current, and needed to be 'rested' periodically to continue functioning. Because these early flashlights also used energy-inefficient carbon-filament bulbs, this occurred at short intervals; consequently they could be used only in brief flashes, hence the popular name flashlight.

Misell's Patent 617,592

1899 Eveready flashlight

A high power torch

The power required by the flashlight can be calculated using the formula P = V x I, where P is power in watts, V is voltage in volts, and I is current in amps. Plugging in the values, we get P = 12V x 0.25A = 3 watts. Therefore, the flashlight would require 3 watts of power to operate.

A flashlight typically contains a battery to provide power for the light source, such as an LED or an incandescent bulb. It does not contain a specific type of cell that would be found in living organisms.

Flashlights and candles produce white light, which is a mixture of different colors. The light emitted by them is a combination of visible wavelengths within the electromagnetic spectrum.

No, a dry cell used in a flashlight is an example of chemical energy, not mechanical energy. The chemical reactions in the battery produce electrical energy that powers the flashlight.

Yes, although it will take a lot longer than in sunlight. The particles of light are called photons and each photon carries a certain amount of energy. As the photon hits the photovoltaic cells of the solar panel, the energy they contain is converted into electrical energy by the excitation of electrons in the board. The stronger the light, the more energy.

A flashlight battery contains stored chemical potential energy that is converted into electrical energy when the flashlight is turned on. This electrical energy is then used to produce light energy, which is a form of radiant energy.

A concave mirror reflects and concentrates light, making it useful in flashlights to focus and direct the light beam in a specific direction. The concave shape helps to gather and redirect light rays emitted by the bulb, resulting in a more powerful and focused beam of light.

If given the chance, light will travel in every direction it can in a straight line till it meets a solid object or cloud. Light from stars hit the earth that are milllions of light years away. So the true answer is unknown.

In 1896, Joshua Lionel Cowen invented a decorative lighting fixture for potted plants which consisted of a metal tube housing a light bulb and a dry cell battery. It failed commercially, and so Cowen sold his company and patents to Conrad Hubert that same year and turned his attention to building and selling model trains. Hubert renamed Cowen's company the American Electrical Novelty & Manufacturing Company and, recognizing the true potential of Cowen's invention, hired David Misell to produce a tubular flashlight for portable use. They donated some models to the New York City police, who responded favorably to it. These early flashlights ran on zinc-carbon batteries, which were poor at providing sustained currents; they would run down after a while and needed to rest before being usable again. Since these early flashlights also used energy-inefficient carbon filament bulbs, this happened rather quickly, and consequently they could only be used in brief flashes (hence their name).

A flashlight is a device whose purpose it to emit light, or be luminous. The 2 most common types of flashlights are LED or bulb. LED, or Light Emitting Diode flashlights run electricity though semiconductors that manipulate the current in a way that releases photons, the tiny packets of energy that make up light. Bulbs use incandescence to produce light, which is produced though the resistance of the material (or filament) to the electricity that is being forced though it. The material heats up, but due to the low oxygen in the glass bulb it cannot oxidize, and instead glows.

To disprove the proposal there's a little man with a flashlight in every black hole looking for a banana, one could appeal to statistical theory for small, finite probabilities of an event multiplied by astronomically large values presumed for instances of black holes in the universe. If at least one DIDN'T have such, then we'd be compelled to conclude, No, not EVERY black hole would evidence a man with a flashlight looking for a banana. Intuitively one might believe that no such phenomena exists, but; with the universe being the size that it is, one might have to admit the events that create little men, flashlights, black holes and bananas would have an infinitesimal but nonzero probability of coinciding. There would, however, remain the considerable difficulty of observing them despite the significant limitations imposed on observation behind the black hole's event horizon, or, if inside, communicating such a discovery to interests outside the black hole.

Nothing would happen, the flashlight simply wouldn't work. Switch the batteries back around and it will work.

This is purely because the contacts don't line up properly. A normal incandescent lamp will work either way round. A modern LED flashlight however is polarity sensitive.

The vast majority of flashlight springs are made of spring steel, also known as piano wire. Several different finishes are applied to this, giving them different appearances.

Zinc chromate finish gives a somewhat yellow color.

Nickel plating gives a silvery finish, with low shine.

Chrome plating gives very shiny silvery finish.

Gold plating gives the obvious gold appearance.

Rarely, springs are made of stainless steel. As it is more expensive and not as good an electrical conductor, stainless is used only when rust resistance is very important.

Other metals such as brass, bronze, and beryllium copper can be used as well. These materials have better electrical properties, but are more expensive and their mechanical properties are not as good, compared to steels. As a result, they are very rarely used in commercial products.

When a light wave is emitted from a flashlight or a candle, the medium that is disturbed is the electromagnetic field. Light is an electromagnetic wave that consists of oscillating electric and magnetic fields propagating through space.