Wild World: Solar Cell Quiz
Solar cells are on everything from pocket calculators to the roofs of buildings. So exactly how do they turn light into energy?
Solar cells use _____ to turn light into energy.
Silicon works as a semiconductor because:
- Added impurities allow electrons to move freely.
- Its molecular structure is a lot like that of copper.
- It forms conductive crystals.
The phosphorous in a solar cell's semiconductor:
- provides free electrons
- bonds with unpaired electrons
- stabilizes the silicon matrix
The boron in a solar cell's semiconductors:
- produces extra electrons
- repels electrons
- attracts electrons
When you combine P-type and N-type silicon in a solar cell:
- Electrons rush from N to P, leaving the N side empty.
- Electrons at the N-P junction eventually form a barrier.
- Nothing happens.
Once equilibrium is reached between the N and P sides of a cell, the cell acts as:
- a transistor
- a capacitor
- a diode
When light hits a solar cell, electrical current comes from:
- electrons traveling from the N side to the P side along a circuit
- electrons traveling from the N side to the P side across the N-P junction
- electrons traveling from the P side to the N side along a circuit
A solar cell can only absorb 15 to 25 percent of the sun's energy because:
- Not all wavelengths of light create the right reaction in the cell.
- There's too much resistance inside the semiconductor.
- both A and B
A typical photovoltaic array has 36 cells. If one is shaded, power production drops by:
- 10 percent
- 25 percent
- 50 percent
To use solar energy in your home, you need:
- a substation
- an inverter
- a converter