SCIENCE
INNOVATIVE
DETECTOR CHALLENGE
P.1
CAUTION!
When experiment is nished, make sure the batteries are disconnected and switch o the unit before you clear away the wires.
Do not apply any components or parts to the unit other than those provided with this kit. Do not lock the motor or other
moving parts. Otherwise it may cause overheating. The toy is not to be connected to more than recommended number of
power supplies.
BATTERY INFORMATION
Use 4 x AA size batteries (not included) For best performance, always use fresh batteries and remove batteries when not in use
Batteries must be inserted with the correct polarity Non-rechargeable batteries are not to be recharged Re-chargeable
batteries are only to be charged under adult supervision Re-chargeable batteries are to be removed from the toy before being
charged Dierent types of batteries or new and used batteries are not to be mixed. Exhausted batteries are to be removed from
the toy The supply terminals are not to be short-circuited Only batteries of the same or equivalent types are to be used Do not
dispose of the batteries in re Do not mix old and new batteries Do not mix alkaline, carbon zinc and re-chargeable batteries
Adult supervision and assistance is required. This unit is only for use by children aged 8 years and older. Not suitable for
children under age 3 years old due to small part(s) and component(s) – CHOKING HAZARD. Read and follow all instructions in
the manual before use. This toy contains small parts and functional sharp points on components. Keep away from children
under age 3 years. 4 x AA size batteries are required (not included) Please retain the information and this manual for future
reference. Instructions for parents are included and have to be observed. Warning. Do not use close to the ear! Misuse may
cause damage to hearing. Do not aim at eyes and face. Do not use improvised projectiles.
WARNING
To understand the working principle of the metal detector, rst you will need to know the relationship between electricity and
magnetism. When an electric current ows through a wire, a magnetic eld will be generated at the same time. So people
round up a wire to form a coil, in order to concentrate the magnetic eld at the center of the coil. When electricity is owing in
the coil, a concentrated magnetic eld will be there. And the reverse holds true: when the coil passes through a magnetic eld,
current will be induced in the coil (if the two ends of the coil are connected). Now this is the basic principle of electricity and
magnetism, called electromagnetism. This metal detector makes use of such principle to detect metallic object. When the ring
(containing the coil) moves near a metallic object, the magnetic eld generated by the coil will induce eddy currents inside the
metallic object. Eddy currents will induce magnetic elds of their own, and there is a second set of coil in the metal detector.
The magnetic elds of the eddy currents will induce electricity in the second coil, so thereby reecting the fact that there is a
metallic object detected! This is the basically working principle of how the metal detector works.
The maze experiment works base on some simple electronic circuit principles. Note that after you have constructed the maze
experiment, no electricity is owing through the kit yet. During the maze experiment, if your wand touches the metal wire,
then the circuit will be connected. The bell will then ring because electricity is owing through the circuit and activates the
motor which makes the spring rod hit the bell. Test your hand skills on the maze experiment by passing the wand through the
maze from one end to the other. If your wand touches the metal wire, the bell will ring. This means you fail in the experiment.
As a result, electric current ows through the circuit and thus the motor will start working and ring the bell. If the wand does
not touch the metal wire, the circuit is not connected and thus no bell ring will be made.
How does the maze experiment work?
How does the metal detector work?
