A student connects resistors to study how their overall opposition to current changes with different types of connections.
(i) Define a series connection and a parallel connection of resistors.
(ii) Explain, with reason, how the equivalent resistance changes when identical resistors are connected (a) in series and (b) in parallel.
(iii) Two identical lamps each having resistance 3Ω are to be operated from a 6V battery. State which type of connection—series or parallel—will allow both lamps to glow at their rated brightness. Justify your answer with suitable reasoning and numerical support.