(a(i))[2]
For the filament wire in the lamp, work out the current.
(a(ii))[2]
For the filament wire in the lamp, work out the number of electrons passing a point in $3.0$ hours.
(b)[2]
Show that the resistance of the filament wire is $480\,\Omega$.
(c)[3]
The filament wire has an uncoiled length of $580\text{ mm}$ and is made of metal. At the lamp’s working temperature, the metal has a resistivity of $6.1 \times 10^{-7}\,\Omega\text{ m}$. Calculate the diameter of the wire.
(d)[1]
The potential difference across the lamp is now lowered. State and explain what happens, if anything, to the resistance of the filament wire.