Fossil fuel-electricity

Acid rain

Photovoltaic cells

Wind power

Water power

Photovoltaic cells make electricity from the sunlight.
This means we can use them instead of a battery.
We connected the p.v. to a buzzer and put it in the sun light.
This made the buzzer sound.
We repeated this using a LED. which shone when the sun fell
on the P.V.
We needed two P.V. leads together to make the small motor work.
My hypothesis is I think it is better to use solar power.

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