Renewable energy week 1,2

week 2 contant

1. What is a voltaic cell?

→ A device that converts chemical energy into electrical energy.

2. What factors determine the amount of voltage produced by a cell?

→ The materials used to construct the cell.

3. What determines the amount of current a cell can provide?

→ The surface area of the cell's plates/electrodes.

4. What is a battery?

→ A combination of two or more cells connected together.

5. What is a primary cell?

→ A cell that cannot be recharged once its chemical energy has been depleted.

6. What is a secondary cell?

→ A cell that can be recharged after its chemical energy has been depleted.

7. What material is used as the positive electrode in a zinc-mercury cell?

→ Mercuric oxide (HgO).

8. What is another name for the Leclanché cell?

→ Carbon-zinc cell.

9. What is used as the electrolyte in a carbon-zinc cell?

→ Ammonium chloride (NH₄Cl).

10. What is the advantage of the alkaline cell as compared with the carbon-zinc cell?

→ Longer life.

11. What material is used as the positive electrode in an alkaline cell?

→ Manganese dioxide (MnO₂).

13. What device is used to test the specific gravity of a cell?

→ Hydrometer.

16. What is the voltage produced by a silicon solar cell?

→ Approximately 0.5 V per cell.

17. What determines the current capacity of a solar cell?

→ The surface area of the cell.

19. What determines the amount of voltage produced by a thermocouple?

→ The materials used and the temperature difference between the junction and the reference/open ends.

20. A thermocouple is to be used to measure a temperature of 2800°F (1537.8°C). Which type or types of thermocouples can be used to measure this temperature?

→ Types B, R, or S.

21. What materials are used in the construction of a Type J thermocouple?

→ Iron and Constantan.

22. What does the word piezo mean?

→ Pressure.