The lamps in a household circuit are connected in parallel because:

(a) Draw a circuit diagram showing two lamps, one cell and a switch connected in series.

(b) How can you change the brightness of the lamps?

Consider the circuit given below where $A, B$ and $C$ are three identical light bulbs of constant resistance.

(a) List the bulbs in order of increasing brightness.

(b) If $C$ burns out, what will be the brightness of $A$ now compared with before?

(c) If $B$ burns out instead, what will be the brightness of $A$ and $C$ compared with before?

If current flows through two lamps arranged:

(a) in series,

(b) in parallel,

and the filament of one lamp breaks, what happens to the other lamp? Explain your answer.