(a)[1]
On Fig. 1.1, draw the symbol for a voltmeter so that it is connected to measure the potential difference across the lamp.
(b)[2]
Use Fig. 1.3 to read off the potential difference $V$ and the current $I$, then enter both in the table.
(c)[1]
Calculate the resistance $R$ of the lamp for both settings of the variable resistor using $R = \\frac{V}{I}$. Put the answers into the table to an appropriate number of significant figures.
(d)[1]
State whether the student’s results show that the resistance is constant. Support your answer by referring to the results.
(e)[1]
Another student says that the resistance of a lamp filament increases when it gets hot. State, giving a reason, whether the observations support this.