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What type of switch is designed to activate when skin completes a circuit?

Pneumatic switch

Touch switch

A touch switch is designed to activate when skin completes a circuit, relying on the electrical conductivity of the human body. When a person touches the switch, it creates a pathway for electricity to flow, thus activating the device connected to it. This makes touch switches particularly user-friendly, especially for individuals with limited mobility, as they often require only a light touch to operate.

In contrast, a pneumatic switch relies on air pressure to activate and would not be influenced by a person's touch. A proximity switch detects the presence of an object (often without direct contact) and is based on the movement or presence of an object rather than skin contact. A mercury switch activates when the mercury inside it tilts, closing a circuit due to gravitational movement, which is also not related to skin contact. Therefore, the functionality of a touch switch is uniquely designed to respond to human touch.

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Proximity switch

Mercury switch

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