Solar Battery Charger Answers
The best way for you to learn is to try these problems on your own before you look at the answers.
2. 2100 mAh ÷ 10 mA = 210 hours
3. 1800 mAh ÷ 10 mA = 180 hours
4. 1845 mAh ÷ 205 hours = 9 mA
6. 2100 mAh ÷ 110 mA = 19 hours
8. 110 mA – 10 mA = 100 mA
9. 2100 mAh ÷ 100 mA = 21 hours
10. 2100 mAh ÷ (100 mA x 0.70); 2100 mAh ÷ 70 mA = 30 hours
11. 2100 mAh ÷ (10.0 + 0.5 mA); 2100 mAh ÷ 10.5 mA = 200 hours
10 hours less than the time in answer #2.
12. Resistors are used to prevent over charging of the battery. Diodes are used, like one-way valves, to keep current from leaking out of the battery and back to the solar panel.
See our other pages for ideas for a science fair project in solar energy.