Question 21M.2.SL.TZ2.a
| Date | May 2021 | Marks available | [Maximum mark: 2] | Reference code | 21M.2.SL.TZ2.a |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Explain | Question number | a | Adapted from | N/A |
A photovoltaic cell is supplying energy to an external circuit. The photovoltaic cell can be modelled as a practical electrical cell with internal resistance.
The intensity of solar radiation incident on the photovoltaic cell at a particular time is at a maximum for the place where the cell is positioned.
The following data are available for this particular time:
Operating current = 0.90 A
Output potential difference to external circuit = 14.5 V
Output emf of photovoltaic cell = 21.0 V
Area of panel = 350 mm × 450 mm
Explain why the output potential difference to the external circuit and the output emf of the photovoltaic cell are different.
[2]
there is a potential difference across the internal resistance
OR
there is energy/power dissipated in the internal resistance ✓
when there is current «in the cell»/as charge flows «through the cell» ✓
Allow full credit for answer based on
