5 school science project ideas
Penny batteries or voltaic piles
Easy school science project ideas to understand the production of energy with two different metals with a sour solution in between is a fun school project. There are many versions of this same project . The higher the stack of different metals, more is the electricity produced good enough to light up an LED.
http://www.projectsforschool.com/product/photon-flower-science-project-for-kids/ take look at the link for a different version of penny battery that is photon flower.
Many projects can be listed under this but simplest to make would be solar oven. A simple school science project which uses direct sunlight as the source of energy to cook food. All it needs is a basic box and lots of aluminium foil paper to concentrate sun rays to slow cook the food. Make a solar cell and this simple kit helps you make one. http://www.projectsforschool.com/product/make-solar-cell-school-project-for-kids/
Solar energy conversion
Simple circuits which use photo voltaic panel to make a science project. For example a solar powered fan is a simple science project to see solar energy conversion to electricity. More gadgets can be used with photo voltaic cell to run on solar panels to make a good science project on energy conversion. For example electric buzzers and LEDs can also be made to work with the same.
Simple electric generators are the most fun school science projects to make and the material is easy to get for the same. All you need is lots of copper and few pieces of strong magnets.
When coil of copper wire will be moved through the magnetic field the current will be generated and hence enough electricity can be generated to light up an LED.
Windmill electricity generator
The coolest school science project which helps understand how wind energy can generate electricity. All what is requires is a great motor and a fan to make electricity. the blades of the windmill should be large enough or if you are using regular fan then the blades can be moved mechanically to demonstrate energy conversion and generation for the same.