Introduction to solar cells week 1 part C

Introduction to solar cells

week 1part C

link to join this course  https://www.coursera.org/learn/solar-cells

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TO PASS 66% or higher

GRADE

100%

Energy sources

LATEST SUBMISSION GRADE

100%

1.Question 1

Select the energy forms which does not have solar radiation as their primary energy source

Wind power

Hydro power

Nuclear power

Correct

The uranium used for nuclear power has its origin in supernovae explosions before the formation of Earth.

Tidal power

Correct

The primary energy source for tidal power is movements of the planets as the Moon and Earth excert tidal forces on each other.

1 / 1 point

2.Question 2

Direct radiation vs fossil fuel

Calculate how many days it would take for the amount of energy coming as direct radiation to equal the amount of fossil fuel available.

Assume that 26,000 TW (2.6·1016 W) of power is available as direct radiation and that the total reserve of fossil fuel is 1355 TWy (or 1.187·1019 Wh).

Please provide the answer in days (example answer 14).

0 / 1 point

3.Question 3

What is the energy payback time of a conventional coal fired power plant?

Typically 2.1 years

Over 100 years

There is no meaningful answer to the question

Correct

A conventional power plant never produces more energy than is used for their production and operation as ever more primary energy in the form of coal must be provided.

The energy payback time is therefore meaningless for any non-renewable power plant.