Below is a transistor system that turns on a sprinkler when a greenhouse gets to

Question

Below is a transistor system that turns on a sprinkler when a greenhouse gets too dry. A gardener changes the sprinkler component to a dehumidifier. What else should be done if this same circuit were to be used to activate a dehumidifier for when the greenhouse gets too humid?

A. Change the emitter and the base of the transistor
B. Place a resistor whose resistance increases with humidity in place of the variable resistor

C. Switch the variable resistor and the moisture detector

D. Nothing at all

Explanation / Answer

C. Switch the variable resistor and the moisture detector

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