Science Fair Ideas

Make It Solar Science Fair Projects

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.