Hand Pressing Flashlight
science homework help?
This is the problem . You win a hand-powered flashlight as a prize in your science fair. The flashlight has a clear plastic case, so you can look inside to see how it works. When you press the handle, a gray ring spins between two coils of wire. The ends of the wire are connected to the lightbulb. So, when you press the handle, the light bulb glows. Explain how an electric current is produced to light the bulb. (Hint: Paper clip are attraced to the gray ring.)
Please help me!!
This sounds like a permanant magnet alternator similar to bicycle dynamos. The gray spinning ring is a magnet. As it spins it produces a rotating magnetic field. When this field passes over/through the coils an electromotive force (EMF or voltage) is produced in the coils and as there is a circuit through the lamp a current flows.
Uruguay v Germany: as it happened
Sami Khedira seals third place for Germany with a late winner as a thrilling game ends 3-2.
 |
 Clear Red Hand pressing 3 LED Flashlight Torch W Strap  US $5.99 |  Blue 2 LED Hand Pressing Flashlight Torch Battery US $1.91 |  LED Pig Shaped Hand Pressing Dynamo Flashlight NEW US $2.90 |
 2 LED Hand Pressing Crank Squeeze Flashlight Torch US $3.49 |  new blue Hand Pressing no battery 3 led Flash Light1135 US $2.99 |  No Battery 3 LED Hand Charge Pressing Flashlight Torch US $2.04 |
 Plastic Shell 2 LEDs Hand Pressing Emergency Flashlight US $5.83 |  New Led Hand Pressing Flashlight Torch Dynamo Lamp US $3.99 |  Digital Matrex 2 LED Hand Pressing Flash Light US $11.74 |
 Gray Green Shell 2 LEDs Hand Pressing Flashlight Torch US $8.66 |  NEW 3 LED lights Dynamo Hand Pressing Flash Light 1135 US $2.79 |  No Battery Hand Pressing Powered Flash Light Torch 1K US $2.20 |
 Hand Pressing Flashlight 4 Pack Set LED high power light Never needs batteries US $19.00 |  Hand Pressing 2 LED Flashlight Torch Green Gray w Strap US $5.83 |
| Powered by phpBay Pro |
 | Pink Fuchsia Cartoon Pig Shape 2 LED Emergency Hand Pressing Flashlight Torch Sale Price: $5.89  |
DescriptionGreat for home, office or outdoor emergency use with two LED bulb and hand-press powered.Just loosen the lock on the side and press on the button to power the flashlight.Ideal for camping, hiking, and emergent occasions, convenient to carry with the hand strap design... |
 | Multifunctional Hand-pressing 5 LED chargable Flashlight with emergency whistle Sale Price: $5.99 |
DescriptionMulti-functionl Hand pressing flashlight can charge the mobile phone under urgent situation and with alarm whistle during stop. The switch has three stages and wavering up for illumination of one lamp... |
 | LED Pig Shaped Hand Pressing Dynamo Flashlight Sale Price: $1.98 |
DescriptionPackage Includes: |
 | Motorola Headset w/Swivel Boom Microphone&PTT For 2-Way Radios Compatible FR50 FR60 TA280 SLK List Price: |
DescriptionFR50 and FR60 Radios Headset is Manual PTT Only. |
 | Led light Transparent Yellow 3-LED Hand Press Flashlight Sale Price: $4.59 |
DescriptionThe bright LED light can be hand operated with an easy squeeze motion. Includes handy carrying strap.FEATURES:Lovely outlook design and strap for easy use, portable Adopt advanced technology of LEDs emitting level of 3 fluorescence tubes Torch is patented environmental electric torch product Only loosen the lock and press on it slightly to generate electricity for lighting purpose Visible distance up to 5 meter, super bright white light Ideal for camping, hiking, and emergent occasions SPECIFICATIONS:Size: 3... |
Hand Press Flashlight
