Started by a School Science Teacher
tree frog

Happy Hoppy Frog Robot


Build your own solar-powered hopping frog!
Manufacturer: OWI
Price:$14.00
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This is a build-it-yourself solar powered kit. Almost comical, this little green amphibian friend leaps with a joyful sense of freedom. Using its hind legs and rubber feet, Happy Hopping Frog jiggles its eyes as a dog would wag its tail acknowledging its love and appreciation to its owner. The tailless, leaping mini solar kit is activated by the power of the sun’s rays; no batteries required. Happy Hopping Frog is the next logical kit if you have already assembled the Super Solar Racing Car or theFrightened Grasshopper. It demonstrates alternative energy principles. No batteries required and has approximately twenty-five parts to assemble.

What are Photovoltaic Cells Made From?

Silicon is the major material in the cells. Pure silicon crystals are poor conductors of electricity. Other elements are added to the silicon, such as, phosphorus and boron. When the energy from the sun hits the cell, the electrons in the elements begin to move around. The sun causes the panel to have a positive and negative side. This electrical difference causes electrons to flow through a diode.

What Factors Affect the Production of a Solar Cell?

The factors that most affect the production of a solar cells are the angle of the panel in relation to the sun, the peak wattage, the light intensity and the hours of sun exposure.

How is Wattage (or Power) Calculated?

The formula for power is   Power=Current X Voltage. Power is measured in watts, current in amperes and voltage in volts.

The Solar Science Kit has a small motor, photovoltaic cell and disc that works well in demonstrating this in a classroom or home setting.

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