Question 22M.2.HL.TZ2.e.i
| Date | May 2022 | Marks available | [Maximum mark: 3] | Reference code | 22M.2.HL.TZ2.e.i |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Calculate | Question number | e.i | Adapted from | N/A |
A fully charged cell of emf 6.0 V delivers a constant current of 5.0 A for a time of 0.25 hour until it is completely discharged.
The cell is then re-charged by a rectangular solar panel of dimensions 0.40 m × 0.15 m at a place where the maximum intensity of sunlight is 380 W m−2.
The overall efficiency of the re-charging process is 18 %.
Calculate the minimum time required to re-charge the cell fully.
[3]
ALTERNATIVE 1
«energy output of the panel =» Vlt OR 6 x 5 x 0.25 x 3600 OR 27000 «J» ✓
«available power =» 380 x 0.4 x 0.15 x 0.18 OR 4.1 «W» ✓
«=» 6600 «s» ✓
ALTERNATIVE 2
«energy needed from Sun =» OR OR 150000 «J» ✓
« incident power=» 380 x 0.4 x 0.15 OR 22.8 «W» ✓
«=» 6600 «s» ✓
Allow ECF for MP3
Accept final answer in minutes (110) or hours (1.8).
