Final answer:
A parabolic reflector in an electricity guarding disc is used to focus electromagnetic radiation. In solar electric generating systems, they concentrate sunlight to heat a fluid which then helps in generating electricity. Parabolic mirrors are also used in other applications to channel heat energy.
Step-by-step explanation:
An electricity guarding disc that uses a parabolic reflector primarily functions to focus electromagnetic radiation. In specific applications such as car headlights, this type of reflector directs the light into a beam. In the context of solar power generation, parabolic reflectors are used in parabolic troughs or concentrating collectors to concentrate sunlight onto a pipe containing a fluid. The fluid absorbs the heat energy, increasing its temperature. This heated fluid is then transferred to a heat exchanger and used to generate steam, which drives turbines to produce electricity in a conventional steam cycle, as illustrated in examples of solar electric generating systems in southern California.
Applications:
- Solar thermal plants use parabolic trough mirrors to concentrate sunlight, heating a fluid to generate electricity.
- Electric room heaters utilize concave mirrors to reflect infrared radiation from hot coils to distribute heat.
- In radio astronomy, concave metal reflectors (dishes) are used to collect and focus radio waves to a receiver for analysis.
Overall, these systems capitalize on the ability of parabolic mirrors to channel heat energy and efficiently transform it into electrical power or to purposefully distribute thermal energy.