Q: Who is the first inventor of hand crank
dynamo?
A: Michael Faraday was the first inventor of the hand
crank dynamo. He was a brilliant scientist, who had
an outstanding contribution to the electromagnetic
field. A lot of physic theories found today have been
derived from his research.
Michael Faraday (Sept. 22
nd
,1791-Aug. 25
th
, 1867) was a famous
British self-taught physicist and chemist. Born to a poor blacksmith
family in Newington, Surrey County he had only attended
elementary school as his formal education. On October 17th, 1831,
Faraday first discovered the phenomenon of electromagnetic
induction. This breakthrough in the field of electric power research
changed human civilization, and his discovery was instrumental in
Maxwell's equations (A set of partial differential equations that,
together with the Lorentz force law, form the foundation of classical
electromagnetism, classical optics, and electric circuits). Due to his
contribution to electromagnetism, he was known as the "Father of
Electricity".
After nearly 10 years of continuous experiments, Faraday
concluded in 1831 the magnetic force of a current coil can not
cause current in another coil. When the current coil power was just
connected or interrupted, the current meter pointer in the other coil
had a slight deflection. After repeated experiments, he confirmed
that when the magnetic force changed, the other coil would
generate current. He also designed a variety of experiments, such
as the relative movement of the two coils, the changes of magnetic
force that can also produce current. In this way, Faraday finally
opened the law of electromagnetic induction. The discovery for
Faraday cleared the road to explore the nature of electromagnetics
and opened a large number of new ways to generate currents.
+
A: In fact, we use two-color light-emitting diodes, that is, two
different colors of LED are in reverse parallel and packaged in
"one" container. As shown on the right, when the current flows
from the left to the right, the upper LED will be lit. On the contrary,
the under LED will be lit. This is the secret of two different colors
light in the forward and reverse rotation.
Q: Why does the LED light produce different
colors when moving the crank in different
directions?
Left Right
Q: How is electricity
generated from the
Dynamo Lantern?
A: When a part of the conductors in closed circuits do the
movement of cutting magnetic induction line in the magnetic field,
the conductors will produce electric current, which is called
electromagnetic induction phenomenon. In our Dynamo Lantern,
the coils are coiled on the central shaft of the motor, with two
magnets mounted on the inner wall of the motor casing. When the
crank is turned, the central shaft rotates, producing a powerful
current, then the LED lantern lights, which is the basis of the
generator.
S
N
Crank
LED Light
Magenet
Coil
Q: What is the role of gears in the dynamo
Lantern?
A: To drive the motor to turn on the LED light requires a high
speed. The hand rotation alone can not reach that speed, so we
use the gears to help. Using the large gear drive pinion to rotate,
we can increase the speed of the pinion. The gear speed is
increased by the transmission ratio of the gears. The transmission
ratio of the gears equal to the ratio of the drive gear speed to the
driven gear speed (or inverse ratio of the number of teeth on the
drive gear to the number of teeth on the driven gear).
Q: What is an LED? How does it light up?
A: LED is short for Light-Emitting Diode, with unilateral conductivity,
as shown below. When the left side of the LED voltage is greater
than the right side of the voltage exceeding a certain threshold, it will
form a positive to negative forward conduction current, than the LED
will be lit. On the contrary, when the LED is not damaged, it will not
form a conduction current, and LED will not be lit.
Do you know? Traffic lights are mostly used LED light as signal light
source. It has many advantages like low power consumption, high
brightness, compact size, light weight, long life span and so on.
The Basic Principle of Gear Rotation
I - Drive gear (pinion) II - Driven gear I - Drive gear II - Driven gear (pinion)
b. Accelerationa. Deceleration
Figure a is the deceleration, that is the pinion drives the large gear
to rotate. Figure b is the acceleration, that is the large gear drives
the pinion to rotate.
Troubleshooting
How To Play
1. If the crank can not drive motor rotation, please check if gears are
installed correctly. Ask parents for help if nessassary.
2. If the LED lantern does not light up, please ensure all connections are in
contact, especially the connectors of the two wires.
1. Turn the crank clockwise or counterclockwise, the LED lantern will glow in
blue and green light.
2. You can let the light irradiate to different angles by adjust the angle of the
LED lantern base. (DO NOT look at the LED light directly when it is lit up.)
3. Quickly turn the crank back and forth, the LED light will alternately glow in
blue and green light.
4. Fill the plasitc lantern cover with water, screw the LED lantern
components into it (as shown below), connect the plug, and turn the
crank, the water will reflect the LED light.
Light Reflection
Water Lantern
Fill in with
water
Attention: The voltage generated by this product is very low that will cause no harm to human.
Do not do the same experiment to other lamp light as it may cause damage and serious injuries.
Let’s learn some
fun facts!
Wow!
You did a great job!
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Questions or comments?
Please call us at 1 510-687-0388 or
email us at service@Tenergy.com
Designed and Distributed By:
Tenergy Corporation
436 Kato Terrace, Fremont, CA 94539, USA
Designed and Manufactured By:
Beijing Today Innovation Technology Co.,Ltd.
No.118, Floor 1, Building 1, No.7, North Ritan Road,
Chaoyang District, Beijing, PRC
Fun Tips: Add confetti or glitter to the water lantern for a light show snow
lantern. Alternatively, add stickers to the outside to make some CRAZY
shadows! For more tips/tricks, please visit our website at www.odevbot.com
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