Assistive Technology Professional (ATP) Practice Test

Question: 1 / 400

Which switch type uses mercury to make contact and activate the circuit?

Touch

Dual

Mercury

The type of switch that uses mercury to make contact and activate the circuit is the mercury switch. These switches operate by utilizing the unique properties of mercury, a liquid metal, which flows within a sealed container. When the switch is tilted or otherwise manipulated, the mercury moves to complete an electrical circuit, allowing current to flow. This mechanic enables the mercury switch to activate devices in response to changes in position or orientation.

Mercury switches are especially valued for their reliability and the ability to respond quickly to motion, making them useful in various applications such as tilt sensors, motion detection, and in some types of thermostats. Other switch types, while functional in their contexts, do not employ mercury as part of their design or operation, which is what distinguishes the mercury switch as the correct answer in this scenario.

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