IPhO 2013, Експеримент — Задача 2.5. Comparing the solar cells

Solar cells — E2 · 7 юли 2013 г.

Warnings and notices

WARNING: Do not use the multimeter as an ohmmeter on the solar cells since the measuring current can damage them. When changing the measuring range on the multimeters, please turn the dial with caution. It can be unstable and may break. Check whether there is a number under the decimal point when measuring – if the dial is not fully in place, the multimeter will not measure, even if there are digits in the display.

Notice: Do not change the voltage on the power supply. It must be 12 V throughout the experiment. (The power supply for the light source should be connected to the outlet (230 V ~) at your table.)

Notice: Uncertainty considerations are only expected when explicitly mentioned.

Notice: All measured and calculated values must be given in SI units.

Notice: For all measurements of currents and voltages in this experiment, the LED-light source is supposed to be on.

Условие

Mount both solar cells (A and B) in the double holder in slot number 15, see Fig. 2.6.

Top-view sketch: the LED light source (a cone with a row of diodes) on the left and, on the right, the two solar cells B (upper) and A (lower) side by side, each with + and − terminals.
Figure 2.6 Top view of light source and solar cells in question 2.5.

2.5a Measure, for the given illumination:

  • The maximum potential difference UAU_{\mathrm{A}}that can be measured over solar cell A.
  • The maximum current IAI_{\mathrm{A}} that can be measured through solar cell A.

Do the same for solar cell B. [0,5 т.]

2.5b Draw electrical diagrams for your circuits showing the wiring of the solar cells and the meters. [0,3 т.]

Отговори

Решение

Оригинал в Архива: exp2.pdf · официални решения: exp2_sol.pdf