Quizzes

Question 1

What are the disadvantages of using renewable energy?

Answer 1

There are several downsides to renewable energies.

1. they cannot produce as much energy as fossil fuel does. This is partly because of their efficiency which is lower than fossil fuel, hence they are producing energy on a smaller scale.
2. They are intermittent sources of energy. It is common for renewable energy sources such as wind and solar to be available during a time that is not much use of electricity. Whereas, during the peak demand, those sources are either unavailable or available in small quantities.
3. Ecological destruction. This is due to an increased disruption impacting wildlife and their migration patterns. An example would be the increased death rate of flock of birds flying through a wind farm.

Question 2

how PV works?

Answer 2

take the photons from the sunlight and use the absorbed photons to free the electrons in the selenium (i.e. the material used in PV cells). With the help of a magnetic field, these free electrons are directed in such a way that they can start creating electricity.

Question 3

how to increase PV efficiency?

Answer 3

• increase absorption level
• decrease surface temperature
• forcing electrons to shape a circuit and not to refill the holes
• optimize the electrical contact areas on modules to increase absorption

Question 4

in-direct use of geothermal is

Answer 4

to generate electricity

Question 5

largest windfarm as of 2015

Answer 5

US

Question 6

strategies to increase power-management in wind power

Answer 6

• geographically distributed network
• import/export power from neighbors
• energy storage