A student investigates how the physical properties of an electrical component change. They measure the electrical power dissipated by the component at different potential differences (voltages) and plot their results on the grid below.
a.[1]
Draw a curve of best fit on the graph.
b.[2]
Use the graph to describe the relationship between potential difference and power for this component.
c.[1]
Use the graph to estimate the potential difference when the power is 4.5 W4.5\text{ W}4.5 W.
d.[3]
The student thinks that the resistance of the component increases as the potential difference increases. Use data from the graph to explain if the student is correct.