- How can human beings handle energy shortage? What is special with this new energy? (P1)
- What are the applications of photovoltaic cells? (P2)
- What are the two types of semiconductors in the photovoltaic cell? What is special with a semiconductor, compared to general materials like water and metals? (P4)
- What is solid-state cell? Why is it important to protect photovoltaic cell? (P6)
- How do scientists improve the cost of solar energy produced through photovoltaic cells? (P7)
- What is scientists' expectation in terms of producing efficient energy? (P8)
- What are the advantages of solar energy produced through photovoltaic cells? (P9-11)
- Is there another possibility of producing solar power? (P12)
3. collocations
- demand for energy (line 2)
- a solution to the problem (line 4)
- electric current (line 30)
- ... is converted directly into electricity. (line 31)
- ... if it is protected from damage. (line 35)
- ..., sand is made up mostly of silicon. (line 39)
- at one time, ... (line 40)
- ..., similar to the way ... (line 43)
- ... is converted into electricity (line 48)
- a significant amount of electricity (line 50)
- advantages over fossil fuels (line 55)
- ... were formed from plants and animals (line 56)
- because of the sun (line 58)
- we cannot wait a million years for more fossil fuels (line 59)
- ..., and in a few decades, they will run out. (line 67)
- plenty of (line 70)
- reliance on fossil fuels (line 76)
4. usage and grammar
- ... see it open automatically by itself? (line 11)
- This program could not exist without the energy produced by photovoltaic cells. (lines 17-18)
- Below this is a layer of silicon. (line 20)
- ..., the cell does not work as efficiently as it should. (lines 36-37)
- However, technology is being developed to make the cells more efficient ... (lines 50-51)
5. Quizlet
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