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Questions on Electric Circuits

Q16. Lorna built the circuit drawn below. All the bulbs are identical.

(a) Complete the table below by writing on or off for each bulb.

switch

bulb

S1

S2

 A

 B

C

D

open

open

 

 

 

 

open

closed

 

 

 

 

closed

open

 

 

 

 

closed

closed

 

 

 

 

4 marks

(b) Lorna then built a different circuit as shown below.

Complete the table below so that both bulbs light up at the same time in this circuit?

bulb

switch

E

F

S3

 S4

S5

on

on

 

 

 

 

1 mark

maximum 5 marks