First you will need to gather all of the materials that you will need to make this
You will need
A 2x4 piece of wood
A battery pack
Drill/Hammer
(Drill bits if you use a drill)
3 Nails/Screws
Roll of magnet wire
Can lid
Sandpapper
After you gather all of your materials you will need to cut the 2x4 into 4 smaller pieces like the ones in the picture above. When you have the wood cut you will need to stack the wood like we have done here and put a nail into the piece on the left.
When this is done you will need to get the can lid and start to sand it. This will scrape the enamel off of the lid so it will be more magnetic. You will need to do this on both sides of the lid.
When this is done you will need to get the piece of wood with the dull end facing in a start to wrap it with the magnet wire. You will need to leave about four inches of the wire exposed.
First nail in the tin can lid, then before the nail is all the way in, wrap the head of the nail/screw with the remaining four inches of tale wire. When it is wrapped nail it all the way in.
Next attach the end of the other piece of wire from the coil to the battery pack
Next you will need to attach the other wire from the battery pack to the wire wrapped around the nail
Once you are done with all of these steps your finished project should look like this.
Explanation: This is a buzzer that makes a high pitched buzzing noise when turned on. The buzzer works by causing the magnetic field to change from on to off, by opening and closing the circuit. The circuit is opened or closed based on the position of the tin can, which is rapidly shifting from being repelled from the coil to being attracted. The buzzing is created by the can lid repeatedly hitting the nail. Electromagnets effects the buzzer because the electricity enables the magnetism, and vise versa, leading to the buzzing sound. The magnetic field is created and destroyed based on the circuit, which is open and closed because of the magnetic field. The buzzer is based o the codependency of the circuit and the magnetic field.