A biomedical engineer is testing a flexible micro-electrode array designed for localized neural stimulation. The array consists of several identical micro-electrodes connected in parallel to a constant voltage source. During testing, the engineer measures the total current flowing through the circuit as different numbers of micro-electrodes are activated. The results are recorded in Table 1.
| Number of active electrodes in parallel | Total current in mA | Potential difference in V |
|---|---|---|
| 8 | 22.4 | 4.20 |
| 6 | 16.8 | 4.20 |
| 4 | 11.2 | 4.20 |
| 2 | 5.6 | 4.20 |
Using data from Table 1, calculate the electrical resistance of only 1 micro-electrode.