A1 LT3 Flashcards
What is required for electrons to move from one material to another?
Contact pressure
What is the term for the interaction of electrostatic and mechanical stresses within certain crystals?
Piezoelectric effect
What effect does mechanical stress on a crystal cause?
Electron displacement
What results from electron displacement in a crystal under mechanical stress?
Current flow
Why do surface atoms have some loosely bound electrons?
Unable to combine with other atoms
When does the thermoelectric effect occur?
When dissimilar metal junction is heated
How do scientists describe light?
Made of photons.
What is the photovoltaic effect?
Electrons leaving atoms due to light energy
What device is used to harness the photovoltaic effect?
Photovoltaic cell
How is most of the electrical energy we use produced?
Magnetism
What is the principle behind generators and alternators producing electricity?
Magnetoelectric effect
What is the opposite phenomenon to the magnetoelectric effect?
Electromagnetic effect
How do electric motors produce motion?
Electromagnetic effect
What happens when materials are rubbed together in regards to electrons?
Electrons are freed
