4) On connecting the torch bulb between the twoterminals of the cell, the bulb lights-up or glows.The bulb lightsup because electricity flows through its filament. 5)Electricity or electric current from one end of the cellflows along the wire through the bulb and then back to the cellalong the other wire.
Contacts. A very thin spring or strip of metal (usuallycopper or brass) that is located throughout the torch,making the electrical connection between the various parts -the batteries, the lamp, and the switch. These parts conductelectricity and "hook everything up," completing thecircuit.
Before people started calling them flashlights,they were called the electric hand torch. Because batteriesand bulbs were still being perfected at the time, the light sourceoften flickered due to poor connectivity. Since people were onlygetting flashes of light, they were nicknamed flashlightsand the name stuck!
Steps
- Gather the necessary materials.
- Strip the ends of the insulated wires.
- Install batteries into the battery pack.
- Attach your wires to the battery pack.
- Fasten the other end of the wire to the metal screw of the bulbholder.
- Test your circuit.
'Electric torch'
When flashlights became popular worldwide, theywere known in Britain as electric torches, however due tothe decline in the use of burning sticks, the word 'electric' wasdropped as the word torch had become synonymous with whatAmericans refer to as a flashlight.An electrical circuit is a path or line throughwhich an electrical current flows. The path may be closed (joinedat both ends), making it a loop. A closed circuit makeselectrical current flow possible. A simple circuit hasconductors, a switch, a load and a power source.
There are seven main components to aflashlight: → Casing: Holds all thecomponents of the flashlight. → Contacts: Thinspring or strip of metal usually copper or brass that serves as theconnection between the battery, lamp and switch.
A 100-watt light bulb clocks in at around 1,750 lumens.The Torch Flashlight from Wicked Lasers, touted as“the world's brightest and most powerfulflashlight,” blinds the competition with a whopping 4,100lumens.
3-volt
flashlight bulb. 2 brass fasteners (brads) Smallcardboard piece for holding bulb.
How to Build the Flashlight:
- Cut the cardboard tube lengthwise and flatten.
- Cut two wires and strip both ends.
- Cut a small cardboard piece to fit over the top of thetube.
- Wrap one of the wires around the body of the light bulb.
In 1910, they became American EvereadyCompany and introduced an Eveready tungsten filament bulb. Theseadvancements garnered them the top name in flashlights. In1922, with 10 million flashlight users several new styles offlashlights were introduced.
Many other materials including drawn steel, platedbrass, copper, silver, even wood and leather have been used. Modernflashlights are generally made of plastic oraluminum. Plastics range from low-cost polystyrene and polyethyleneto more complex mixtures of ABS or glass-reinforcedepoxies.
At least 120 lumens of light output.
For a flashlight to be an effective self-defensetool, it needs to be bright enough to disorient attackers. Anythingless than 120 lumens just won't get the jobdone.Best Flashlight – Our Top Picks
- Streamlight 74751 Strion. This is the best flashlight on ourlist.
- SureFire P2X Fury Tactical.
- Fenix PD35 TAC.
- Anker LC130.
- Klarus XT11GT.
- ThruNite MINI TN30.
- Maglite ML300L 6-Cell.
Tough Torches: 12 Best Self Defense Flashlights
- Fenix TK20R Tactical Flashlight.
- EagleTac T25C2 XM-L2 XLamp Flashlight.
- SOG Dark Energy DE-06 Flashlight.
- Taser Strikelight Stun Gun Flashlight.
- SureFire Defender Tactical Flashlight.
- SureFire P1R Peacekeeper Tactical Flashlight.
- Pelican 7060 Tactical Flashlight.
- SureFire UDR Dominator Tactical Flashlight.
A flashlight (in North American English) ortorch (in most Commonwealth countries) is a small, portablespotlight. Its function is a beam of light which helps to see. Itusually requires batteries. The light is made by a small lightbulb. Unlike previous batteries, it used a paste electrolyteinstead of a liquid.
Background: A series circuit is one in whichelectricity flows along a single conductor through two or moreloads. In a parallel circuit, the electricity has more thanone path through the circuit. A typical two-cellflashlight has the cells connected inseries.
How do batteries work? The cathode and anode (thepositive and negative sides at either end of a traditionalbattery) are hooked up to an electrical circuit. Thechemical reactions in the battery causes a build up ofelectrons at the anode. This results in an electrical differencebetween the anode and the cathode.
Electricity flows through a thin tungsten wire in thelight bulb called the filament. The filament used in abulb has a property called "resistance." A filament has alot of resistance to electricity. As a result of this resistance,the filament heats up and starts glowing, converting electricalenergy to light energy.
Working Principle: A light-emitting diodeis a two-lead semiconductor light source. It is a p–njunction diode that emits light when activated. When asuitable voltage is applied to the leads, electrons are able torecombine with electron holes within the device, releasing energyin the form of photons.
Electricity is the presence and flow ofelectric charge. It is a form of energy which we use topower machines and electrical devices. When electrical charges arenot moving, electricity is called staticelectricity.
Every time a light bulb is turned on and off itheats and cools rapidly, which stresses the filament, causing it tobecome weaker and brittle. When the filament gets thin enough fromrepeated wear, it can snap, breaking the electrical current, andcausing the bulb to burn out.
