An engineer is investigating the electrical characteristics of an experimental silicon-carbide heating element designed for a high-temperature industrial furnace.
During a test run, the engineer gradually increases the potential difference across the heating element and measures the resulting current. Using these values, the engineer determines the resistance of the element at each stage of the heating process.
The recorded data is presented in Table 1, with one resistance value missing.
Calculate the missing resistance value. Give your answer to an appropriate number of significant figures.
Table 1
| Potential difference in V | Current in A | Resistance in Ω\OmegaΩ |
|---|---|---|
| 1.5 | 0.22 | 6.8 |
| 3.0 | 0.38 | 7.9 |
| 4.5 | 0.51 | 8.8 |
| 6.0 | 0.62 | |
| 7.5 | 0.71 | 10.6 |
| 9.0 | 0.79 | 11.4 |