[填空题]
The government of a medium sized city plans to replace coal powemtp18 mt n:vr)r p(a)ob1h21+xb, iowm+p7akg t m pc 7zxlh6i (clants with photovoltaic cells to power the )o cl6(1p7ix mp,ho+at kwbmh 1+gc 7xbia 2(zcity.
The following data are available:
Total area available for photovoltaic cells = 62.6$km^2$
Maximum intensity of light incident on photovoltaic cells = $1.36\times10^3$ $Wm^{−2}$
Average efficiency of energy conversion in photovoltaic cells = 20 %
Hours of sunshine in one month = 150 hours
1.Explain why the government's choice to reduce its reliance on coal would be beneficial to the Earth's climate.
2.Outline, in terms of energy changes, how electrical energy is generated from coal.
3.Using the data given, calculate in $GJ$ the maximum expected energy generation for one month. $Electrical energy obtained$ = $\times10^6\,GJ$
