Flashlights

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.

If you put the batteries in a flashlight in the wrong direction, the electrical current won't flow properly, preventing the flashlight from turning on. It's important to insert the batteries according to the correct polarity indicated on the device to ensure it functions correctly.

Flashlights are safer than candles after an earthquake because they do not pose a fire hazard like open flames from candles do. In a potentially unstable environment, open flames can easily ignite flammable materials, whereas flashlights use battery-powered light sources that are less likely to cause accidental fires. Additionally, flashlights are more reliable and provide better visibility in dark or confined spaces compared to candles.

Battery powered flashlights are used as source of light where normal cabled electrical power can not reach or if there is a power outage. To define function of flashlights, these basically convert electrical energy stored as chemical energy in batteries to light and some wasted heat in the lamps.

As semiconductor LEDs are more energy efficient, specially designed bright LEDs are replacing conventional flashlight lamps in most modern flashlights.

- Neeraj Sharma

This is a chemical change. The corrosion and leaking of the battery involve the breaking and rearranging of chemical bonds within the battery, leading to the formation of new substances (such as corrosion products).

The center electrode post of an ordinary flashlight battery is typically made of carbon. This post plays a crucial role in conducting electricity from the battery to power the device.

Most governmental authorities these days recommend using flashlights and other, battery powered devices instead of candles in any emergency.

The reason for this is the obvious, simple safety reason: an unattended, or carelessly used candle can start a fire. An unattended or carelessly used flashlight cannot.

Candles are fine if used carefully. They should not be left unattended, they should not be used within a foot of anything that can catch fire, and they should be extinguished when you leave the room. It is also important to be very careful around children and pets who can accidentally tip a candle, causing a fire.

A flashlight transforms electrical energy into light energy and a small amount of heat energy. The electrical energy powers the light bulb, which then emits light energy to illuminate its surroundings.

A flashlight gives off light energy, which is a form of electromagnetic radiation. The light energy is created when the flashlight's batteries produce electrical energy that powers the light bulb or LED to emit light.

The most common reason a flashlight might not light is that the batteries are dead or incorrectly inserted. If the batteries are working properly, another possible reason could be a faulty bulb or circuitry within the flashlight.

The light stay dim long as the cards is piled on top of the flash light.

Human eye can adjust to see better in the dark and it might cause the thinking that after dimming by piling card over flash light for a while and it go brighter a little.

Photons emitted from a flashlight will continue to travel indefinitely until they are absorbed by a material or collide with another particle. Photons do not "decay" in the sense of breaking down into smaller particles. Once they are emitted, photons will travel at the speed of light until they interact with something.

Yes, a battery is typically used in a flashlight to provide the electrical power needed for the light source to illuminate.

No, the bulb will not light up because there needs to be a complete circuit for the electricity to flow through. When you press the switch of the flashlight, it completes the circuit, allowing the bulb to light up.

Conrad Hubert invented the flashlight in response to the need for a portable and reliable light source that could be used during power outages and in other situations where a quick and convenient source of light was necessary. He saw an opportunity to create a product that would provide illumination on the go and revolutionize how people could light up their surroundings in various situations.

There is more energy in the battery than that given off as light and heat for two reasons.

1)

Some energy is lost due to resistance in the battery. As current flows, energy is lost to heating of the battery due to this internal resistance.

2)

As the battery operates, the voltage falls until it is too low to heat the bulb to incandescence. Yet energy remains in the battery, but this last energy is at too low a voltage to be useful.

The current produced by a 1.5V flashlight cell would be lower than the current produced by a 12V car battery. This is because current is directly proportional to voltage in a circuit with constant resistance, following Ohm's Law (V = IR). Therefore, the higher voltage of the 12V car battery would result in a higher current compared to the 1.5V flashlight cell.

It is possible to break a foot by dropping a heavy object like a metal flashlight on it, especially if it falls from a significant height or with great force. The impact can cause fractures in the bones of the foot. It is important to seek medical attention if you suspect a broken foot.

Two flashlights may have different brightness levels due to variations in the power source, LED quality, or circuit design. Factors such as battery charge, LED efficiency, and lens design can all impact how bright a flashlight appears.