Question

A student is building a model of a parallel circuit consisting of a battery, a switch, five light bulbs, and wires. When she connects all of the
components of her model, none of the bulbs light up. Which of the following could be the problem with her model? (AKS 10b / DOK 2)
1
2
3
4
One of the bulbs is burnt
out
One or more of the wires is not connected to the battery
The switch isn't properly closed
The resistance of the light bulbs prevents current from flowing through the circuit
O A 1, 2, and 4
OB 1, 2, and 3
OC. 1, 3, and 4
OD. 2, 3, and 4

Answer 1

Answer:

(D) 2, 3, and 4

Explanation:

Given that the connection is parallel,

The parallel circuit consisting of a battery, a switch, wires, and 5 bulbs has been shown in the figure.

But none of the bulbs light up upon completing the connection.

The given possible reasons are:

• Option (1): One of the bulbs is burnt out.

As the connection is parallel, so the current from the battery is divided to all 5 bulbs, is one bulb is burnt out, it will not stop the current flowing through the other bulbs, so this is not the possible reason.

• Option (2): One or more of the wires is not connected to the battery.

If one or more wire is not connected to the battery, then there will be no current in the circuit, so, no bulb will glow. Hence this may be the possible reason.

• Option (3): The switch isn't properly closed.

If the switch isn't properly closed, then the circuit is not closed. Then there will be no current in the circuit, so, no bulb will glow. Hence this may be the possible reason.

• Option (4): The resistance of the light bulbs prevents current from flowing through the circuit.

If the resistance of the bulb is very large and the current flowing in it is too less, then there will not be sufficient to glow the bulb. so, no bulb will glow. Hence this may be the possible reason.

So, the possible may be options (2), (3), and (4).

Hence, option (D) is correct.