Question

Look at the circuit diagram and answer the questions.
figure

(a) What happens when B is closed and A is open?
(b) What happens when B is open and A is closed?
(c) Which bulbs are connected in series?
(d) Which bulbs are connected in parallel?

Answer 1

(a) When switch B is closed and switch A is open, no bulb will glow because the circuit is not complete in this case.

(b) When switch B is open and switch A is closed, bulbs 1, 2 and 3 will glow.

(c) Bulbs 2 and 3 are connected in series.

(d) Bulbs 1 and 4 are connected in parallel.