Page 139 - SK Year 5 Science DLP

CLOSE THE SWITCH,
CLOSE THE SWITCH,
LET’S TEST
LET’S TEST OPEN THE SWITCH
OPEN THE SWITCH
To investigate the relationship between the
AIM
conditions of switches and bulbs.

Six bulbs, six bulb holders, four dry cells, four dry
APPARATUS AND
MATERIALS cell holders, six switches, and connecting wires
with crocodile clips.
STEPS

1. Build a series circuit using three 2. Build a parallel circuit using three bulbs
bulbs and three switches. Label and three switches. Label the bulbs as
the bulbs as A, B, C and the D, E, F and the switches as S 4, S 5, S 6.
switches as S 1, S 2, S 3.

3. Close the switches in both circuits simultaneously.
4. Then, open and close the switches by following the instructions in the table
as shown below. Record your observations.

Circuit Condition of switches Condition of bulbs

A B C
S1 S2 S3
Series close open open does not light up does not light up does not light up
circuit open close open

open open close

D E F
S4 S5 S6
Parallel close open open
circuit open close open

open open close

(a) State the condition of the bulbs if S 1 is closed while S 2 and S 3 are
opened. Give an inference to your observation.
(b) Which bulb will light up if S 5 is closed while S 4 and S 6 are opened?
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5.2.6, 5.2.7