If current flows through two lamps arranged:

(a) in series,

(b) in parallel,

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

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?

How do you think the brightness of two lamps arranged in parallel compares with the brightness of two lamps arranged in series (both arrangements having one cell)?

The figure below shows a variable resistor in a dimmer switch.

How would you turn the switch to make the lights:

(a) brighter, and

(b) dimmer?

Explain your answer.

State two factors on which the electrical energy consumed by an electrical appliance depends.