What is used to start, stop or change the direction of the current in a circuit?

• A. Switches
• B. Fuses
• C. Relays
• D. Capacitors

Answer: (A)

To start, stop, or change the direction of current in a circuit, you need a component that can open or close the path and, if needed, reconfigure connections. A switch provides that control by making or breaking the electrical connection; it can also be arranged to route current through different paths to reverse polarity or direct a motor in the opposite direction. Fuses are protective devices that interrupt current only after an overload. Capacitors store energy and influence current during charging or discharging, but they don’t provide deliberate control over current flow. Relays are controlled switches operated by a separate signal, but the direct mechanism for starting, stopping, or reversing current is the switch.