Which component is used to start or stop current flow in a circuit?

Which component is used to start or stop current flow in a circuit?

• A. Conductor
• B. Switch
• C. Fuse
• D. Resistor

Answer: (B)

A switch is the component that opens or closes the circuit to start or stop current flow. When the switch is closed, the path is complete and current can flow to the load. When it’s opened, the path is broken and current stops. This control function is what makes switches useful for turning devices on and off. A conductor simply provides a path for current but doesn’t control whether it flows. A resistor limits current but doesn’t enable or disable flow. A fuse protects by interrupting current during faults, not for normal on/off control.

A switch is the component that opens or closes the circuit to start or stop current flow. When the switch is closed, the path is complete and current can flow to the load. When it’s opened, the path is broken and current stops. This control function is what makes switches useful for turning devices on and off. A conductor simply provides a path for current but doesn’t control whether it flows. A resistor limits current but doesn’t enable or disable flow. A fuse protects by interrupting current during faults, not for normal on/off control.