While testing a small torch bulb, a student finds that 0.8 C of charge passes through the filament and the bulb converts 1.6 kJ of electrical energy into heat and light.
(i) Convert the given energy to joules.
(ii) Calculate the potential difference across the filament while it is glowing.
(iii) If the bulb were connected to a 4.0 V supply instead, how much energy would be converted when the same charge of 0.8 C passes through it?