Alternative Essay Example | Topics and Well Written Essays - 500 words - 1

Alternative - Essay Example The free electrons move into a circuit all through a module of 60 cells, and they flow back through a solid contact layer into the cell at the bottom. The flow creates a closed circuit of electricity (Boxwell, 2010). A solar panel has various advantages. It provides a free and clean energy that is environment-friendly and available at any place with sunlight. Unlike generators for electricity, solar panels produce no noise and emissions that pollute the environment. Solar panels are less expensive with lower operating and maintenance costs than renewable energy systems (Rassie, 2002).  On the other hand, solar panels bear some disadvantages. Solar panels are normally very delicate and can be easily damaged compared to other energy systems. They also require more equipment such as the inverter to convert direct electricity to alternating current to aid electricity usage on the power network. The energy from solar panels is more inclined to intermittent issues due to unpredictable weather. During the cloudy and rainy weather, solar energy using home may run short of energy. Therefore, these issues make this energy unreliable. Fan energy: Long before the 20th century, wind turbines were used to harness the force of the wind to grind grain and pump water. With the advancement of technology, giant fans are made today to produce electricity. On top of every wind turbine, there is a box called a nacelle with three blades attached to it. These propeller-like blades connect to the rotor. Also, there is anemometer on the nacelle to measure wind direction and speed. During the windy periods, the wind rotates the nacelle to face into the direction of the wind. The kinetic energy from the wind (wind energy) turns the blades to create mechanical energy around the rotor. This rotor is connected to a shaft which rises from the generator housing - where a magnetic rotor rotates inside the loops made of copper wire. The