Question 8
EXPERIMENTAL TEST II: Electrical Conductivity in Certain Vegetables
Some organisms have an ability to conduct electricity. In this experiment, the electrical conductivity in various vegetables; cucumber, eggplant, and carrot will be measured.
Objectives
1. To measure electrical conductivity in cucumber, eggplant, and carrot.
2. To measure and compare electrical conductivity in a vegetables based on different electrode distances.
You will need
- Electrical “Blackbox”
- Cucumber
- Eggplant
- Carrot
What to do
1. Take a wire, then plug the base probe to the hole in the Blackbox apparatus.
2. Take a cucumber, then put it on an experiment chamber. Make sure the cucumber is located at the end of closed experiment chamber space. Press the cucumber so that the electrode needle sticks tightly with the cucumber.
3. Plug the tip point probe of red wire into the hole number 1 which is located on the side of an experiment chamber.
4. Write down the value of the gauge meter in Table 1 in your WORKSHEET
5. Repeat steps 3-4, to hole number 2, hole number 3, hole number 4, and hole number 5 which are located on the side of an experiment chamber.
6. Discard the cucumber from the experiment chamber, then clean the electrode needle and electrode probe with tissue papers.
7. Repeat steps 2-6 by with egg plant and carrot.
8. Make sure all of your data are written in your WORKSHEET.
Question 1. (3 points) Make a graph based on your data in Table 1. Give a legend in your graph.
Editorial blank recording table: the separate Test II worksheet and measured data were not supplied. Enter actual meter readings and units, and measure actual electrode separations if available. Do not treat a hole number as a known distance.
| Vegetable | Hole 1 | Hole 2 | Hole 3 | Hole 4 | Hole 5 |
| --- | --- | --- | --- | --- | --- |
| Cucumber | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ |
| Eggplant | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ |
| Carrot | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ |
Safety: use only the supplied low-voltage battery apparatus under adult/teacher supervision. Never connect this experiment to mains electricity. Disconnect power before changing wires or cleaning probes; avoid short circuits, hot batteries and sharp electrodes. Keep hands dry, keep liquids away from electrical connections, and do not eat the tested vegetables.
Some organisms have an ability to conduct electricity. In this experiment, the electrical conductivity in various vegetables; cucumber, eggplant, and carrot will be measured.
Objectives
1. To measure electrical conductivity in cucumber, eggplant, and carrot.
2. To measure and compare electrical conductivity in a vegetables based on different electrode distances.
You will need
- Electrical “Blackbox”
- Cucumber
- Eggplant
- Carrot
What to do
1. Take a wire, then plug the base probe to the hole in the Blackbox apparatus.
2. Take a cucumber, then put it on an experiment chamber. Make sure the cucumber is located at the end of closed experiment chamber space. Press the cucumber so that the electrode needle sticks tightly with the cucumber.
3. Plug the tip point probe of red wire into the hole number 1 which is located on the side of an experiment chamber.
4. Write down the value of the gauge meter in Table 1 in your WORKSHEET
5. Repeat steps 3-4, to hole number 2, hole number 3, hole number 4, and hole number 5 which are located on the side of an experiment chamber.
6. Discard the cucumber from the experiment chamber, then clean the electrode needle and electrode probe with tissue papers.
7. Repeat steps 2-6 by with egg plant and carrot.
8. Make sure all of your data are written in your WORKSHEET.
Question 1. (3 points) Make a graph based on your data in Table 1. Give a legend in your graph.
Editorial blank recording table: the separate Test II worksheet and measured data were not supplied. Enter actual meter readings and units, and measure actual electrode separations if available. Do not treat a hole number as a known distance.
| Vegetable | Hole 1 | Hole 2 | Hole 3 | Hole 4 | Hole 5 |
| --- | --- | --- | --- | --- | --- |
| Cucumber | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ |
| Eggplant | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ |
| Carrot | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ | \_\_\_\_\_ |
Safety: use only the supplied low-voltage battery apparatus under adult/teacher supervision. Never connect this experiment to mains electricity. Disconnect power before changing wires or cleaning probes; avoid short circuits, hot batteries and sharp electrodes. Keep hands dry, keep liquids away from electrical connections, and do not eat the tested vegetables.