Electromagnetic nail on a battery
|Electromagnetic nail on a battery|
|Age Range||5-8 (grades 1-2), 8-11 (grades 3-5), 11-14 (grades 6-8), 14-18 (grades 9-12)|
|Group Size||small (1-5), medium (6-20)|
|Setup Time||short (0-5 min)|
|Duration||short (5-10 min)|
|Materials||1 aa battery, magnets, nail, insulated copper wire with ends stripped|
Students will create a homopolar motor which will spin a screw on the bottom of a battery.
A homopolar motor is a device that converts a magnetic field and a direct electrical current (DC) into motion. The main parts are a permanent magnet with an adjacent metal disc and shaft; homopolar means only one pole or side of the magnet is next to the rotor. Direct current is applied to the disc and it rotates due to the effects of the current passing through the magnetic field.
This Is How You Play
- Place a few strong neodymium magnets on the head of screw.
- Allow the tip of the screw shaft to stick to the negative end of a single AA battery.
- With your finger, hold the copper end of an insulated wire on the positive end of the battery.
- Gently touch the other end of the copper of the insulated wire to the magnets attached to the screw.
- The screw should start spinning underneath the battery.
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