APhO 2001, Експеримент — Задача 2. Question (2)
2nd Asian Physics Olympiad — TAIPEI, TAIWAN — Experimental Competition — Thursday, April 26, 2001 · 26 април 2001 г. · 7 т.
Read This First
Time Available : 5 hours
Read This First:
- Use only the pen provided.
- Use only the front side of the answer sheets and paper.
- In your answers please use as little text as possible ; express yourself primarily in equations, numbers and figures. If the required result is a numerical number, underline your final result with a wavy line.
- Write on the blank sheets of paper the results of all your measurements and whatever else you consider is required for the solution of the question and that you wish to be marked.
- It is absolutely essential that you enter in the boxes at the top of each sheet of paper used your Country and your student number (Student No.). In addition, on the blank sheets of paper used for each question, you should enter the number of the question (Question No.), the Section label, the progressive number of each sheet (Page No.) and the total number of blank sheets that you have used and wish to be marked for each question (Total No. of pages). If you use some blank sheets of paper for notes that you do not wish to be marked, put a large cross through the whole sheet and do not include them in your numbering.
- At the end of the exam please put your answer sheets and graphs in order.
Условие
Measure the characteristics of the solar cell, without electrical bias under white light illumination. (Note: the distance between the light source and the solar cell box should be kept at 30 cm as shown in Fig. 5.)
a. Draw the circuit diagram you used.
b. Measure the short-circuit current , .
c. Measure the open-circuit voltage, .
d. Measure the I vs. V relationship of the solar cell with varying load resistance and plot the I-V curve.
e. Determine the maximum output power of the solar cell.
f. Determine the load resistance for the maximum output power.
g. Calculate the filling factor,
Отговори
b. 2.0 mA ~ 4.5 mA
Accepted range from the official marking scheme; the sample data give Isc = 3.03 mA.
c. 2.7 V ~ 3.2 V
Accepted range from the official marking scheme; the sample data give Voc = 2.77 V.
e. 4.2 mW < Pm < 9.0 mW
Accepted range from the official marking scheme; the sample data give Pm = 6.4 mW.
f. 0.6 kΩ < R < 1.3 kΩ
Accepted range from the official marking scheme; the sample data give Rm = 0.85 kΩ.
g. 62% < FF < 81%
Accepted range from the official marking scheme; the sample data give FF = 76 %.
Решение
(2) (Question (2) : 7 points)
Measure the characteristics of the solar cell, without electrical bias under white light illumination. (Note: the distance between the light source and the solar cell box should be kept at 30 cm as shown in Fig. 5.)
a. Draw the circuit used.
⊙Correct circuit diagram (1 point)
b. Measure the short-circuit current , .
( ××) (2.0 mA ~ 4.5 mA)
⊙Correct value (0.5 points)
c. Measure the open-circuit voltage, .
⊙Correct value (0.5 points)
( ××) (2.7 V ~ 3.2 V)
d. Measure the I vs. V relationship of the solar cell with varying load resistance and plot the I-V curve.
⊙Correctly measure the I, V data and properly plot the I-V curve (2 points)
- Proper data table marked with variables and units (0.2 points)
- Properly choose the size of scales and units for abscissa and ordinate that bear relation to the accuracy and range of the experiment (0.3 points)
- Correct I, V data and correct I-V curve (1.5 points)
e. Determine the maximum output power of the solar cell.
| (mW) | (kΩ) | FF | |
|---|---|---|---|
| 1 | ×× | ××× | ××% |
| 2 | |||
| 3 |
⊙Accurate method of determining (1 point)
⊙Correct value (1 point)
f. Determine the load resistance for the maximum output power.
⊙Correct load resistance for maximum output power
(0.5 points)
g. Calculate the filling factor,
⊙Correct estimation of the filling factor (FF)
(0.5 points)
Оригинал в Архива: exp.pdf · официални решения: exp_sol.pdf