18-Volt Flashlight

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can 19.2 volt battery be used instead of an 18.0 volt battery for a sears craftman flashlight? Sears Craftman seem to have changed their standard battery for their removable flashlight/drill/etc from 18.0 to 19.2 volts. Are they interchangeable? It should not make any difference as long as the housings fit.

physics work help plz? . The resistance of a wire is (Points: 1) doubled by decreasing the length by 1/2. increased by decreasing the cross-sectional area. always the same regardless of the gauge of the wire. highest if the wire is copper. 18. According to Kirchhoff's second law, for a multiple loop circuit, the sum of the potential differences as you go around a loop (Points: 1) depends upon which loop you look at. is always zero. is always more at the beginning of the loop than at the end. cannot be determined without more information. 19. The law that states that the amount of current is directly proportional to the voltage impressed across a circuit and inversely proportional to the resistance of the circuit is (Points: 1) Ohm's Law. Coulomb's Law. Newton's First Law. Kirchhoff's First Law. 20. The high percentage of lightning strike survivors can be attributed to the fact that (Points: 1) water is an excellent insulator. most survivors have on thick-soled shoes which insulate one's body from most of the shock. the path of least resistance is often through the water on the outside of your body and into the ground. there is almost no potential difference between one's body and the ground, so most electricity passes harmlessly through one's body with little or no damage. 21. A car battery is wired with the type of circuit that ensures it will start every time, even if a part of the battery has been damaged. This safety feature of the battery can be attributed to which type of circuit? (Points: 1) open series series and parallel parallel 22. Neutral objects are attracted to both negatively and positively charged objects because (Points: 1) they actually have a slight imbalance of charge. charge is conserved. they give off some of their charges to the ground. there is a redistribution of their internal charges. 23. An electroscope initially has a net negative charge. The foils come together when the electroscope is touched by a human hand because (Points: 1) humans have a net positive charge. humans have a net negative charge. the human body is a conductor. the human body is an insulator. 24. An electroscope has separated leaves. When you bring a positively charged rod slowly near it, the foils come together. You conclude that the electroscope was initially (Points: 1) positively charged. negatively charged. neutral. not positively or negatively charged, nor was it neutral. 25. A volt is a unit of (Points: 1) charge. electrical potential. current. work. 26. Select whether the following statement is True or False. The electrical field inside of a charged conducting sphere is greater than, and opposite to, the electrical field outside of the sphere. (Points: 1) True False 27. Occupants of an airplane flying in the middle of a thunderstorm are not in danger of being struck by lightning because (Points: 1) there is no conducting path to the ground. electric charges would mutually repel one another. the metal surface acts as an electrical shield. of all of the above. 28. The reason a bird can perch on a bare high voltage wire and not be hurt is that (Points: 1) a bird has very large electrical resistance. a bird has a protective layer of skin on its feet. there is no potential difference between the two points where the bird contacts the wire. the wire has a protective coating on it that does not conduct electricity. 29. How much power is used by a 6.0 V flashlight that draws 0.5 A of current? (Points: 1) 30 W 12 W 6 W 3 W 30. Electrical resistance in a wire depends on the wire's (Points: 1) conductivity. length. thickness. conductivity, length, and thickness.

How fast would 17 LEDs drain 3 AAA batterys, if the LEDs were 18 candela each? I am using LEDs from this site : http://www.superbrightleds.com/leds.htm They are product number RL5-W18-15 Tech specs are : http://www.superbrightleds.com/specs/w18015_specs.htm I want to replace the 17 weak LEDs in my cheap flashlight, I have no idea how powerfull they are, with 17 of these 18 candela LEDs. The light operates on 3 AAA batterys that I believe are in a series. I think all LEDs run on 1.5 volts. My question is how long would good quality batteries last? Thanks in Advance. I'll check that site. Also there are no resistors, or anything else for that matter on the PCB that the resistors are soldered to. Basically what I want... is an LED flashlight that is so bright that it will actually stun and temp blind an intruder in my home at night. It's not quite as simple as replacing the LEDs. Most of them have a current limiting resistor in series. Changing to brighter LEDs would possibly mean changing the resistor too.
Click on the link below. This guy has a TON of info on many things!

Two Nichrome wires in a circuit with thin/thick wire.? The following questions refer to the circuit shown in Figure 18.73, consisting of two flashlight batteries and two Nichrome wires of different lengths and different thicknesses as shown (corresponding roughly to your own thick and thin Nichrome wires). The thin wire is 48 cm long, and its diameter is 0.25 mm. The thick wire is 15 cm long, and its diameter is 0.36 mm. Figure: http://www.webassign.net/csem/18-73.jpg part a) The emf of each flashlight battery is 1.5 volts. Determine the steady-state electric field inside each Nichrome wire. Remember that in the steady state you must satisfy both the current node rule and energy conservation. These two principles give you two equations for the two unknown fields. E inside thin wire = _______V/m E inside thick wire = _________ V/m _________ For this question i am a little confused for the calculation of E. I was using the equation E=emf/L (or volts/length) but i wasnt getting the right answers. Is there another way I should be calculating it? You can't use that averaged method because the resistance is not uniformly distributed along the circuit.
Apply Ohm's Law once for the entire circuit to find the current. This must be constant throughout the circuit at steady state, so you can apply Ohm's Law again to each wire segment to calculate the potential difference across that segment. THEN you can use E1 = V1/L1 and E2 = V2/L2 to calculate the E field in each segment.
You'll need to know the resistivity ρ of nichrome and the formula
R = ρL/A for the resistance of a wire with length L, constant resistivity ρ and constant cross-section area A to get the resistances R1, R2 of the wire segments. Then I = Vtotal/Rtotal = 3V/(R1+R2). In the segments you have V1 = I*R1, V2 = I*R2; and from these you have E1 and E2 as above.

Can you name 50 random things in your bedroom? so... i was looking for one my ps2 game, and failing. I started looking at the things lying around my room, and i thought... man i am weird, or something... So, can you guys name 50 things that are sitting on your desk, on your bed, floor in the closet, whatever... but inside your bedroom. 01 4 psp games 02 night vision goggles 03 cavin and hobbes comic book 04 portable ham radio 05 laser level 06 empty toolbox 07 trigonometry homework 08 screwdriver 09 bluetooth headset 10 dirty spoon 11 pile of broken glass 12 lcd cleaner spray 13 dsl phone line filter 14 uhf coaxial cable connecters 15 canadian quarter 16 nail clippers 17 glue 18 pen 19 fork 20 bucklies cough medicine 21 brush from haircutting kit 22 majicjack usb adaptor 23 rosin core solder 24 ultraviolet led flashlight 25 broken chair 26 another spoon 27 peltier junction 28 dlink router 29 another broken chair 30 usb monitor color calibration device 31 5/8 inch sparkplug socket 32 about 50 different alan keys 33 2x dvi to hdmi converters 34 nmhi battery 35 final fantasy 7 ps1 game 36 mini torch 37 dvi to vga converter 38 110 volt spare wall outlet 39 remote part of ethernet cable tester 40 some razor blades 41 scsi pci card 42 49 key piano 43 about 20 blank dvds 44 drywall fixing tools and drywall compound 45 portable analogue tv 46 shortwave radio 47 blue glass bottle 48 expired amoxicillin tryhydrate 49 psp pandora tool battery 50 nikon scsi film scanner if you dont want to take time for 50, then just post 10 or 20, just random stuff lying around... Wow... It is quite interesting what you can tell about a person's character, likes and dislikes just from the stuff in their bedroom.. I did not expect this to be so interesting, but it is quite impressive to read over. Your question: "Can you name 50 random things in your bedroom?"
My answer : "Yes I can"
Cheese to you.

can somebody instruct me how to make a 20 watt led flashlight with two 9volt batteries? i know i saw this in a video recently but i dont remember the specifics and i want to know other peoples opinions before i spend money on it. 20 watt led's are 16-18 volts and i feel like two 9 volts should do. what do you guys think?

How long do you charge a Black and Decker 18-volt battery? I have four Black and Decker 18-Volt Firestorm batteries. I've been charging them on the simple wall charger for about three hours each. They charge but I just think they should last a little longer than they do in my drill, circular saw, flashlight, and weed eater. (all interchangable black and decker 18 volt products) Am I charging them too much or too little? If you are using a charger that is intended for the battery, you may leave it on cradle overnight to make sure you are charging it at full capacity.
If you are using a substitute charger, have it charged longer but check if the battery will get hotter than normal. If it won't get hot, have it charged overnight.

battery combination for 18 volt flashlight bulb? Maximum voltage input for an 18 volt flashlight lamp? I am attempting to build a homemade flashlight. I have purchased a few Dewalt brand, xenon 18 volt, 10.5 watt flashlight bulbs. My question is, "What combination of batteries, such as two 9-volt batteries, twenty-four 1.5-volt batteries, three 6-volt etc. would be the best for getting the brightest possible light beam out of these bulbs?" I suppose this would require getting the correct combination of watts, volts & amps, but I'm hoping someone out there can give the the number & type of batteries that would be best for powering these bulbs. I have tried using two 9-volt alkaline batteries, but this did not produce a very bright beam. Please help! For all practical purposes, the larger the battery pack, I am talking weight to make this simple, the longer the burn time on the lamp.
Example 12 AAA batteries have less amp hour capacity than 12 D batteries .
Both will provide 18 volts.
Oh goody, here comes the pun.
The AAA pack weighs less than the D pack.
The D pack will last longer than the AAA pack.
So, how much weight do you want to pack.
The proper voltage, regardless of how you achieve it from any combination of batteries will give the maximum brightness.
The 18 volt Dewalt zenon bulb at 10.5 watts will draw 0.583 amps.
I am not sure what the amp hour capacity of a D cell is, but I do not thank it can put out 0.583 amps for very long.
The three 6 volt lantern batteries would be a better choice.
How about the Dewalt 18 volt rechargeable battery the lamps were made to run on?
I am back now.
I did a Google search for [d cell battery amperage]
http://www.google.com/search?hl=en&source=hp&q=d+cell+battery+amperage&rlz=1R2GZAZ_enUS334&aq=8&oq=D+ce&aqi=g10
The Wikipedia listing has a chart that shows amphour capacities for manny common bateries.
http://en.wikipedia.org/wiki/Battery_(electricity)
The AAA battery can put out 0.625 amps for about one hour.
that would run your 0.583 amp lamp for just a little over one hour.
The D cell can putput 20.5 amps for one hour.
Doing the math, 20.5 devided by0.583 gives you about 35 hours of battery life.
The 9 volt battery is not listed on the chart.
12 AAA batteries = 1 hour.
12 D batteries === 35 hours
There is a lanten battery at the bottom of the chart than can output 52 amps for one hour.
3 of those lantern batteries would give you about 89 hours.
I hope that I got the math correct.
I would still suggest the rechargable Dewalt 18 volt battery as your best bet.
I hope that this helps you.
Wingman

18-Volt Flashlight is from category: Flashlights.