Question
Download Solution PDFThe _______ is a device that is able to sense light levels and alter the current flowing between emitter and collector according to the level of light it receives.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe phototransistor is a device that is able to sense light levels and alter the current flowing between the emitter and collector according to the level of light it receives.
Concept:
- A Phototransistor is an electronic switching and current amplification component which relies on exposure to light to operate.
- When light falls on the junction, reverse current flows which are proportional to the luminance.
- These are operated by light rather than electric current.
- These devices act like opto isolator.
- An optoisolator is an electronic component that transfers electrical signals between two isolated circuits by using light.
- Opto-isolators prevent high voltages from affecting the system receiving the signal.
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