A student measures the current in a fixed resistor for four values of the potential difference across it. Table 1 shows the results.
Table: The current in a fixed resistor for four values of the potential difference across it
| Potential difference in volts, V | Current in amperes, A |
|---|---|
| 1.0 | 0.05 |
| 2.0 | 0.10 |
| 3.0 | 0.15 |
| 4.0 | 0.20 |
Describe the pattern shown by the results in Table 1.
Write down the equation that links potential difference, current and resistance.
Calculate the resistance of the resistor. Use the results for a potential difference of 4.0 V.