Technology 4 ESO – Unit 2 ELECTRONICS page 19 activity 9
a) Watch the video on “The Light Dependent Resistor (LDR)” and answer:
- I) In an LDR the resistance depends on what?
- II) What happens if we put our hand over the LDR? Why?
- III) Why the LDR can act as a switch?
b) In this link we can find information about the “band gap”: https://en.wikipedia.org/wiki/Band_gap
Explain in your own words what is the “band gap”?
