An engineer investigates how the current in a micro-heating element, HHH, varies with the voltage across it.
The table shows the engineer's results:
| Voltage across HHH (V) | Current in HHH (A) |
|---|---|
| 0.0 | 0.00 |
| 1.5 | 0.35 |
| 3.0 | 0.64 |
| 4.5 | 0.85 |
| 6.0 | 1.00 |
| 7.5 | 1.10 |
State the equation linking voltage, current, and resistance.
The engineer plots a graph of current on the y-axis against voltage on the x-axis and draws a curve of best fit. At a voltage of 3.6 V3.6\text{ V}3.6 V, the current read from the graph is 0.74 A0.74\text{ A}0.74 A.
Calculate the resistance of component HHH at this voltage. Give your answer to 2 significant figures and state the unit.
Describe how the resistance of component HHH changes as the voltage increases. Explain this change.