(a)[2]
On Fig. 3.1, draw the symbol for an ammeter and the symbol for a voltmeter in the positions that are correct for this investigation.
(b(i))[1]
Suggest how he alters his circuit to do this.
(b(ii))[1]
Fig. 3.2 gives the current $I$ readings on the ammeter for each voltage. Record the value of $I$ shown on the meter for each voltage.
(b(iii))[1]
Use the equation $R = \frac{V}{I}$ to calculate the resistance $R$ of the lamp at $4.0\,\text{V}$ and at $8.0\,\text{V}$. Include the unit in your answers.
(c)[2]
State two physical changes observed in the lamp as the potential difference $V$ increases.