Question

What is the order of pressure inside photo cell?

Answer 1

Explanation:

A photocell is a resistor that changes resistance depending on the amount of light incident on it. A photocell operates on semiconductor photoconductivity: the energy of photons hitting the semiconductor frees electrons to flow, decreasing the resistance.

An example photocell is the Advanced Photonix PDV-P5002, shown in Figure 21.2. In the dark, this photocell has a resistance of approximately 500 kΩ, and in bright light the resistance drops to approximately 10 kΩ. The PDV-P5002 is sensitive to light in the wavelengths 400-700 nm, approximately the same wavelengths the human eye is responsive to.Figure 21.2 shows a simple circuit illustrating how it can be used as an ambient light sensor feeding either a digital or an analog input to the PIC32.

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Answer 2

Explanation:

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