Create your electricity by making a homemade battery using salt water

This project is very easy to do! What you need are an aluminium can, a thin copper plate, two spacers of rubber, a motor of 2-3 volts e.g. CD ROM motor, 1 litre of water with 2-3 tablespoons of salt.

The duration of the time of rotation of the motor is over 7 minutes. When the battery runs out  you can reof its charge shall be filled again with water and salt. To secure the success of this experiment, it is necessary to have a motor with a low power consumption 15-20 mA max. and a voltage of 2-3 volts. It is not recommended to use these motors in toys.

How to Make a Matchbox Microphone

Make a microphone out of a matchbox and pencil leads. Listen to sounds and music from the other side of the house using this DIY microphone. Simple audio electronics project. You will also need a battery, some wires and clips, and a pair of headphones or a speaker. Fun and simple science experiment, and great to do with children.