Science 30 January 2000 Diploma Examination

January 2000 LA 2 - Sample Answer
Wind power is obtained by using a turbine or windmill that is turned by the wind. The
turbine turns a generator that produces electricity.
The energy transformations start with the sun's rays heating earth's surface. Heat from
the surface of the earth heats the air above it. This heated air is lighter than surrounding
cold air. When the cold air pushes the warm air out of the way, wind is produced.
The advantages of wind power include the fact that it is renewable and non-polluting.
Disadvantages include the fact that it can produce electricity on a commercial scale in
only a few areas where the wind is strong and consistent. It is best used where it can be
fed into an existing power grid so it can be supplemented when the wind is not blowing.
January 2000 LA 2 - Scoring Guide
SCORE
4
Standard of
Excellence
3
2
Acceptable
Standard
1
SCORING DESCRIPTIONS
The response is complete, well organized, and reflects thorough
understanding and logical consistency of thought. The explanation of
how the electricity is produced and the description of the energy
transformations is complete and correct. The advantages and
disadvantages of the energy source are thoroughly explained.
The response is mostly complete, organized, and reflects correct
understanding. The explanation of how the electricity is produced and
the description of the energy transformations is mostly correct. The
advantages and disadvantages of the energy source are clearly
explained.
The response is organized, and is generally logical and consistent .
The explanation of how the electricity is produced and the description of
the energy transformations is adequate. The advantages and
disadvantages of the energy source are explained reasonably well.
The response is incomplete, disorganized, and reflects poor
understanding. The explanation of how the electricity is produced and
the description of the energy transformations is inadequate. The
advantages and disadvantages of the energy source are poorly explained.
0 The response does not address the question at a Science 30 level.
02/08/00