Which device is designed to select one of multiple circuits from a single device?

Which device is designed to select one of multiple circuits from a single device?

• A. DPDT
• B. Relays
• C. Rotary Switch
• D. Solenoids

Answer: (C)

The idea is a device that lets you route a single input to one of several outputs using a single control. A rotary switch does exactly this: a common terminal is connected to the input, and as you turn the knob, the contact arm lands on one of many fixed contacts, connecting the input to the chosen circuit. This lets one device select among multiple circuits. Relays are electromagnetically actuated switches that change state when a coil is energized, which is great for automatic control of circuits but not a manual multi-path selector from one device. A DPDT switch is a specific two-pole, two-throw configuration that can switch two circuits at once, offering limited paths rather than many options. Solenoids are actuators that move or actuate components in response to current, not switches for selecting between circuits.

The idea is a device that lets you route a single input to one of several outputs using a single control. A rotary switch does exactly this: a common terminal is connected to the input, and as you turn the knob, the contact arm lands on one of many fixed contacts, connecting the input to the chosen circuit. This lets one device select among multiple circuits.

Relays are electromagnetically actuated switches that change state when a coil is energized, which is great for automatic control of circuits but not a manual multi-path selector from one device. A DPDT switch is a specific two-pole, two-throw configuration that can switch two circuits at once, offering limited paths rather than many options. Solenoids are actuators that move or actuate components in response to current, not switches for selecting between circuits.