科学素养与生活应用·英语30篇（2）

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太阳能电池板如何将阳光转化为电能

Solar panels contain photovoltaic (PV) cells made mainly of silicon, a semiconductor material.
When sunlight hits a PV cell, photons knock electrons loose, creating direct current (DC) electricity.
An inverter then converts DC into alternating current (AC), matching household electrical standards.
Panel efficiency depends on angle, shading, temperature, and local sunlight intensity—not just size.
Rooftop systems feed surplus power back to the grid in many regions, earning credits on utility bills.
Newer thin-film panels perform better in diffuse light, making them suitable for cloudy cities or north-facing roofs.
Maintenance is minimal—mainly occasional cleaning and checking connections every few years.
Though manufacturing uses energy and resources, most panels repay that 'carbon debt' within three to five years.