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Flashlights
Usually battery powered, flashlights are a portable means of creating artificial light. They allow a person safer navigation through darkened areas.
687 Questions
What kind of mirror is used for flashlight?
Concave Mirrors, so that the light can be concentrated and so that it points forward. This is how we are able to see using a flashlight beam.
:) Catherine
What is the difference between a laser light and the light beam from a white flashlight?
A laser light is coherent, meaning its waves are all in phase and directional, giving a narrow beam. In contrast, light from a white flashlight is incoherent and spreads out in various directions. Laser light also has a single color (wavelength), while white light contains a mix of colors.
How does a rechargeable torch work?
Crank flashlights are very handy devices that are particularly useful in a pinch. No need to worry about charging the flashlight or ensuring it has fresh batteries, the crank flashlight is a great last resort and will always light up your campsite when you need it.
The crank flashlight contains a small generator much like the ones that are used to provide electricity around the country. The difference is that the flashlight's generator, also called a dynamo, is powered by manual cranking of the arm.
The principal behind the generator is that of induction. When you move a coil of wire through a magnetic field, a voltage is induced into the wire, which then creates electrical current that flows through the circuit. Inside your crank-powered flashlight is a wire coil that is inside a magnetic field. When you crank the arm of the flashlight, you are actually moving this coil in the magnetic field. As the coil moves, voltage is induced and current then flows through the circuitry and lights the bulb of the flashlight.
You've probably noticed that you can crank your flashlight for a few minutes and then get a reliable light source for a while afterward without actively cranking. This is because the crank flashlight has rechargeable battery cells inside that store the energy that you've created from cranking. In this way you don't have to actively crank to use the flashlight, but can crank and then have the flashlight operate on batteries.
Read more: How Does a Crank Flashlight Work? | eHow.com http://www.ehow.com/how-does_4911443_crank-flashlight-work.html#ixzz1Xz4cG0fe
ELEPHANT!
Describe the path electrons take in a simple flashlight circuit?
In a simple flashlight circuit, electrons flow from the negative terminal of the battery through the metal conductor to the light bulb, where they pass through the filament, creating light. The electrons then continue flowing through the metal conductor to the positive terminal of the battery, completing the circuit.
I didn't say that... But that is basically a correct description of the energy transformations. Part of the energy also gets wasted, into heat energy (different parts of an electrical circuit have resistance), and infrared radiation, i.e., non-visible light.
Why dont you see a beam of light from a flashlight refract as it travels across a room?
Because the amount of bending is too small for your eye/brain system to detect.
During typical conditions of atmospheric refractivity gradient, a horizontal beam of
visible light can be expected to refract vertically by about 14 feet in 10 miles, by a
little less than 2 inches in one mile, and by about 0.0000086 inch in the 12-foot
width of the room.
h = (d1d2) / (1.5 K)
d1, d2 in miles
K = 6/5 for light
What is the purpose of the concave mirror behind the bulb in the flashlight?
You want a torch to emit light in a beam, in only one direction. But the bulb in the torch emits light in all directions, the mirror reflects the light going in the wrong direction(towards the inside of the torch) back out the front of the torch making it brighter. It is concave so as to focus the light more.
Why is a beam of light from a flashlight that is shining in fog straight?
In fog, the water droplets scatter the light in all directions. The beam appears straight because the individual water droplets scatter the light particles in a way that causes them to still travel in the same general direction as the original beam.
What is a metallic element which serves as a negative pole in the common flashlight battery?
The metallic element that serves as the negative pole in a common flashlight battery is zinc.
What heating element is found inside the flashlight bulb?
A flashlight bulb typically contains a tungsten filament as the heating element. When electricity passes through the filament, it heats up and produces light through incandescence.
Describe the motion of charges through a flashlight from one terminal of a battery to the other?
When the flashlight is turned on, electrons move from the negative terminal of the battery through the wires and components of the flashlight to the positive terminal. This movement of charges creates an electric current that powers the light bulb or LED in the flashlight, causing it to produce light.
How do the currents produced by a 1.5 Volt flashlight cell and a 12 Volt car battery compare?
Do you mean the maximum possible current, or the current in normal applications? Car batteries have low internal resistance since auto starter motors draw a lot of current, a CCA (cold cranking amperage) rating of around 600A is not unusual for a car battery some can be even higher.
A flashlight cell is not designed for that sort of current, while the maximum will depend on cell size and chemistry, I suspect a couple of amps might be a good guess at a maximum. However, the rechargeable NiCad or NiMH cells used in portable power tools can probably put out significantly more for short periods.
Driving the same load resistance the current from a 12V battery will be 8 times that from a 1.5V battery. Assuming the load is not overloading the battery (and it might overload the flashlight cell if the resistance is too small).
This is simple arithmetic: 12÷1.5=8
If energy is not created or destroyed what happens to the light and heat of the flashlight?
energy cannot be created. Instead it changes forms of energy. the energy of a battery is chemical energy. the chemical energy from the battery changes to to electric energy when you turn it on. Then it changes again into heat and light energy. That energy will go on and change into some other kind of energy and so on forever.
What metal is used in a flashlight battery?
The metal used in a flashlight battery is typically zinc. Zinc-carbon batteries and alkaline batteries are common types of batteries used in flashlights, both of which contain zinc as a key component in their construction.
Why does your Maglite flashlight blow the light bulb as soon as you turn it on?
If you have recently purchased light bulbs for your light, it is probably because you have bought the wrong voltage bulb. There are several different types of MagLites and each one must match the voltage of the batteries to the voltage of the bulb.
For example: If you bought a 3v bulb (2-cell) and put it in a 4-C Maglite, you'll blow the bulb
(4 batteries x 1.5v = 6v total)
There are two types of brand-name bulbs for incandescent (non-LED) Maglites. The original OEM bulb was a Krypton bulb and the newer, brighter bulbs are Xenon. They are available for all two through six cell C and D size Maglite flashlights.
Krypton bulbs
LWSA201 - 2-Cell Krypton
LWSA301 - 3-Cell Krypton
LWSA401 - 4-Cell Krypton
LWSA501 - 5-Cell Krypton
LWSA601 - 6-Cell Krypton
Xenon bulbs
LMSA201 - 2-Cell Xenon
LMSA301 - 3-Cell Xenon
LMSA401 - 4-Cell Xenon
LMSA501 - 5-Cell Xenon
LMSA601 - 6-Cell Xenon
See the "Related Links" for examples of each
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.
How many times can you reflect light with mirrors and a flashlight?
That would depend on the quality of the mirror. If the mirror reflects a greater percentage of the light, then the light can be reflected more times, before it becomes too faint to be recognizable.
That would depend on the quality of the mirror. If the mirror reflects a greater percentage of the light, then the light can be reflected more times, before it becomes too faint to be recognizable.
That would depend on the quality of the mirror. If the mirror reflects a greater percentage of the light, then the light can be reflected more times, before it becomes too faint to be recognizable.
That would depend on the quality of the mirror. If the mirror reflects a greater percentage of the light, then the light can be reflected more times, before it becomes too faint to be recognizable.
The battery uses chemical energy,
to produce electrical energy,
to produce heat energy in the bulb,
which releases electro-magnetic energy.
And get to know more details of flashlight energy here:
http://forum.fonarevka.ru/showthread.php?t=7498
Does flashlights use electric chemical or mechanical energy?
Flashlights typically use electric energy to power the light bulb or LED inside them. The electric energy is usually provided by batteries. Some flashlights may also use rechargeable batteries, which store chemical energy that is converted to electric energy when the flashlight is turned on.
What are the three energy transformations that take place when you use a flashlight?
The energy transformations that I would mention are as follows:
- Chemical Potential Energy --> Electrical Energy (In Battery)
- Electrical Energy --> Light Energy (In Bulb)
- Electrical Energy --> Heat Energy (In Bulb)
A dry cell is used in a flashlight to convert what to light?
Chemical energy into light energy
more specifically
i.e. dry cell converts chemical energy into electrical energy
flashlight converts electrical energy into light energy
What energy transformation takes place when you use a flashlight?
In a flashlight, electrical energy from the battery powers the light bulb, which then converts electrical energy into light energy and heat energy.
Can you make a tazer out of a flashlight?
It is not safe or recommended to attempt to make a taser out of a flashlight or any other household item. Tasers are designed with specific safety features and mechanisms to prevent accidental harm. It's best to leave the manufacturing and handling of tasers to professionals.
Does shining a flashlight on the surface of crystals affect their appearance?
Yes, shining a flashlight on the surface of crystals can enhance their appearance by making them sparkle and reflect light. The light highlights the unique features and colors of the crystals, making them more visually appealing.
