Question 14
Linh set up an electric circuit with 4 identical bulbs and batteries, as shown
below.
She used 2 identical switches, S1 and S2, for controlling light bulbs B1, B2, B3,
B4 as shown in the following table.
a. In the circuit, put a slash ( / ) to identify the position of switches S1 and S2,
and label them with S1 and S2, respectively.
b. When switch S1 and S2 were closed, which one of the bulbs will have the
dimmest bulbs? Explain why.
c. Linh modified the circuit by replacing bulb B4 with an electric rod. After
modification, she closed all switches. She observed that bulb B3 did not light up
while bulb B1 and B2 still lighted up. Explain why.
below.
She used 2 identical switches, S1 and S2, for controlling light bulbs B1, B2, B3,
B4 as shown in the following table.
a. In the circuit, put a slash ( / ) to identify the position of switches S1 and S2,
and label them with S1 and S2, respectively.
b. When switch S1 and S2 were closed, which one of the bulbs will have the
dimmest bulbs? Explain why.
c. Linh modified the circuit by replacing bulb B4 with an electric rod. After
modification, she closed all switches. She observed that bulb B3 did not light up
while bulb B1 and B2 still lighted up. Explain why.