Question

Which list of components creates a circuit through which an electric current can flow?
1. a generator, two light bulbs, and an open switch
2. a generator, a light bulb, and a closed switch
3. a battery, insulated wires, a buzzer, and an open switch
4. a battery, insulated wires, and a buzzer

Answer 1

To create a circuit through which an electric current can flow, it is essential to have a complete path (closed circuit) for the current.

Let's analyze the options:

1. **a generator, two light bulbs, and an open switch** - This option contains an open switch, which means the circuit is not complete and current cannot flow.

2. **a generator, a light bulb, and a closed switch** - This option has a closed switch, which means the circuit is complete and allows current to flow.

3. **a battery, insulated wires, a buzzer, and an open switch** - The presence of an open switch means this circuit is not complete, preventing current flow.

4. **a battery, insulated wires, and a buzzer** - This option may allow current to flow if the circuit is closed (assuming it can be completed somehow, but it doesn’t explicitly mention a switch).

Thus, the best option that clearly ensures a complete circuit and allows electric current to flow is:

**2. a generator, a light bulb, and a closed switch**.