____ can be added to a series circuit to turn components on and off.

____ can be added to a series circuit to turn components on and off.

• A. Capacitor
• B. Resistor
• C. Inductor
• D. Switch

Answer: (D)

A switch is added to a series circuit to turn components on and off. In a series path, current must flow through every element, so when the switch is closed the circuit is complete and the load operates. When the switch is opened, the path is broken and current stops everywhere in the loop, turning all components off. Capacitors store and release charge but don’t provide a deliberate on/off control; resistors simply limit current and drop voltage, and inductors resist changes in current. The switch is the component that creates and removes the current path, making it the tool for turning the circuit on and off.

A switch is added to a series circuit to turn components on and off. In a series path, current must flow through every element, so when the switch is closed the circuit is complete and the load operates. When the switch is opened, the path is broken and current stops everywhere in the loop, turning all components off. Capacitors store and release charge but don’t provide a deliberate on/off control; resistors simply limit current and drop voltage, and inductors resist changes in current. The switch is the component that creates and removes the current path, making it the tool for turning the circuit on and off.