February 2012
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Flashlight Battery

Flashlight Battery
Flashlight Battery
Why does the battery for a flashlight need to be a lot bigger than the battery in the radio?

This is a school problem I can't figure out:

A radio that uses a small 9 V battery requires 0.05 A from the battery. A large flashlight that has a 6 V battery requires 1.0 A from its battery. Explain why the battery for the flashlight needs to be a lot bigger than the battery in the radio.

Any ideas?

Power (ie the amount of energy per second) = voltage X current

so for the radio P = 0.05 X 9 = 0.45 J/s
for the torch P = 6 X 1 = 6 J/s

so the power for the torch is much greater so it will need larger batteries that can store more energy.



Dorcy 41-1403 LED Bottle Opener Light with Batteries and Fold-Away Knife, Colors May Vary Dorcy 41-1403 LED Bottle Opener Light with Batteries and Fold-Away Knife, Colors May Vary

List Price: $6.49

 

Description

Dorcy Key Chain Led Light w/ Bottle Opener 41-1403

Features

  • Super Bright 5MM LED
  • Durable Aluminum Construction & Compact Design
  • Convenient Bottle Opener
  • Fold-Away Pocket Knife
  • Includes Batteries
"ABC Products" - Belt Clip - Magnetic or Stand-up ~ Battery - Countdown - Electronic Timer (Large Display - Will Count Down from 99 min. 59 Sec.)

List Price: $10.97

 

Description

Simple easy to use countdown timer for general use - Wll down from 99 min. 59 Sec. ~ Built in memory recalls previous countdown time ~~ Large easy-to-read display - Loud Alarm when time is up ~~ Requires one "AAA" battery (is included) - Size Unit is 2...

Features

  • Simple easy to use countdown timer for general use - Will down from 99 min. 59 Sec.
  • Large easy-to-read display - Loud Alarm when time is up
  • Built in memory recalls previous countdown time
  • Comes with belt clip - Magnetic back to attach to metal - easel for stand-up
  • Requires one "AAA" battery (is included) - Size Unit is 2.5 in. W x 2.5 in. x .5 in. Thick
Chef's Light 5 LED Flexible Neck Clamp-On BBQ Grill / Work Light Chef's Light 5 LED Flexible Neck Clamp-On BBQ Grill / Work Light

 

Description

Enjoying great food can now be enjoyed at any time, day or night. The Chef's Light flexible lamp is perfect for early morning breakfast feasts or late night cookouts. Cooking outdoors has never been so easy!

Make nighttime or early morning outdoor cooking easier with this clip-on flexible chef's light...

Features

  • 5 Led lights for bright night cooking
  • Flexible lamp to perfectly point the light
  • Adjustable base clamp so you can hook it to any surface (DO NOT ATTACH DIRECTLY TO HOT GRILL)
  • Uses 3 AA batteries (not included)
Streamlight Nano Light Miniature Keychain LED Flashlight Streamlight Nano Light Miniature Keychain LED Flashlight

 

Description

Truly tiny, the Nanolight is a weatherproof, personal flashlight featuring a 100,000 hour life LED. Includes a non-rotating snap hook for easy one handed operation when attached to a keychain.

Features

  • Easily attaches/detaches to just about anything with convenient pocket clip or key ring
  • Up to 8 hrs. run time
  • Machined aircraft-grade aluminum with anodized finish
  • Powered by 4 alkaline button cells (included)
  • 100,000 hr. lifetime high-intensity LED
Rayovac SE3DLN Sportsman Xtreme 300-Lumen LED Lantern Rayovac SE3DLN Sportsman Xtreme 300-Lumen LED Lantern

List Price: $34.00

 

Description

With optimized beams, rubber grips, and tactical switches, Rayovac's Sportsman Xtreme lights are what you need for the outdoors when you head for the hills, woods, or even the backyard. Nicely compact and ultra-portable at just 7 inches tall and under 3...

Features

  • 4-watt LED lasts 100,000 hours and never needs replacing
  • 300 lumens with 3 modes: high, low, and strobe
  • Easy-find green LED light blinks every 5 seconds when lantern is off
  • Runs on three D alkaline batteries; run time 72 hours (high mode) and 150 hours (low mode)
  • Water resistant and has a full Lifetime Warranty
9 LED 400 nM UV Ultra Violet Blacklight Flashlight 3AAA, 7301UV400 9 LED 400 nM UV Ultra Violet Blacklight Flashlight 3AAA, 7301UV400

List Price: $19.99

 

Description

Just some of the uses for UV LED lights:
- Bugs/Insect Detection
- Minerals Hunting

- Police use it for scanning the crime scene
Unbreakable
- Checking currency and ID
- Fluorescent inks/dyes used as anti-counterfeiting measures
- Examining artwork and glasswork for hidden repairs
- Locating damaged/cracked glassware
- Detecting scorpions

Specifications:

Bulb Life :100,000 Hours
Battery Life :Approximately 40 hours on 3 AAA batteries (not included)
Switch Type :P ress on, Press off from rear cap
Weight :2 oz...

Features

  • - Automobile Air Condition Fluid Leaking (Freon)
  • Bulb Type :395-400nm UV LED
  • Body Material:Aluminum with "O" rings for water resistance
  • Battery Require:3 x AAA Alkaline Battery (Not Included)
  • - Durable - Aluminum, LED are long Life and
Learning (#1655) Learning is Everywhere! Learning (#1655) Learning is Everywhere!

 
Survival Kit Survival Kit

 

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