In building automation, a sensor used to detect light presence is typically called what?

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Multiple Choice

In building automation, a sensor used to detect light presence is typically called what?

Explanation:
Detecting light presence relies on a device whose electrical response changes with light exposure. A phototransistor fits that role because light photons generate charge carriers that change its current, producing a usable signal that indicates light presence or intensity. The other options measure different quantities—thermistors for temperature, barometers for air pressure, accelerometers for motion or vibration—so they aren’t used to detect light.

Detecting light presence relies on a device whose electrical response changes with light exposure. A phototransistor fits that role because light photons generate charge carriers that change its current, producing a usable signal that indicates light presence or intensity. The other options measure different quantities—thermistors for temperature, barometers for air pressure, accelerometers for motion or vibration—so they aren’t used to detect light.

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