What does a closed switch indicate in a circuit?

What does a closed switch indicate in a circuit?

• A. The circuit is open
• B. Current is running through it
• C. It stores energy
• D. There is zero voltage

Answer: (B)

When a switch is closed, it completes the circuit and creates a continuous path for electric charges to flow from the power source, through the wires and components, back to the source. This lets current run through the circuit, which is why devices powered by the circuit turn on. If the switch were open, there would be a break and no current would flow, so the device stays off. Energy storage is not about the switch’s state, and there can be voltage in the circuit even with current, though the closed switch itself carries very little voltage drop because it presents a low resistance path.

When a switch is closed, it completes the circuit and creates a continuous path for electric charges to flow from the power source, through the wires and components, back to the source. This lets current run through the circuit, which is why devices powered by the circuit turn on. If the switch were open, there would be a break and no current would flow, so the device stays off. Energy storage is not about the switch’s state, and there can be voltage in the circuit even with current, though the closed switch itself carries very little voltage drop because it presents a low resistance path.