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  1. Magnetic Field | Week 1
    4 Topics
  2. Electromagnetic Field
    4 Topics
  3. Electromagnetic Induction
    6 Topics
  4. The Transformer
    5 Topics
  5. Simple A.C Circuit
    4 Topics
  6. Models of the Atom
    2 Topics
  7. Radioactivity
    3 Topics
  8. Half Life
    8 Topics
  9. Energy Quantization
    3 Topics
  10. Photoelectric Effect
    4 Topics
  11. Wave Particle Paradox
    3 Topics

Lesson 10, Topic 3
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Uses of Photocell

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They are used in

I. Photometer

ii. Burglar alarms

iii. Automatic door

iv. Television cameras

v. Counting operations

vi. Sound production from film track

Screen Shot 2020 10 30 at 2.26.40 AM

When light of appropriate frequency falls on the cathode photosensitive surface, electrons are emitted. Since the anode is positive with respect to cathode, electrons are attracted to the anode, and the flow of electrons completes the circuit and current flows.


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