Solar panels

What are most solar cells made from?

• Copper

• Concrete

• Silicon

• Coal

What is the carrier of the electric current from solar cells?

• Silicon atoms

• Holes

• Water

• Electrons

What from the Sun causes the solar cell to produce the electricity?

• Photon particles of sunlight

• The heat from the Sun

• The shadow under the solar cell

What creates the potential difference (voltage) in a solar cell?

• A battery

• The bonds between the silicon atoms

• An outside generator

• The p - n junction

How efficient are the normal commercial solar cells?

• Less than 10%

• 15-20%

• As high as 46%

• More than 70%

What are bad about solar panels?

• they use too much energy

• they are unreliable

• they are expensive

• they aren't as efficient

Will solar power ever run out?

• False

• True