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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

OFF

OFF

OFF

OFF

open

closed

OFF

OFF

OFF

OFF

closed

open

ON

ON

ON

ON

closed

closed

ON

ON

OFF

OFF

Each correct line gains one mark

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

OPEN

CLOSED

CLOSED

correct line gains one mark

1 mark

maximum 5 marks