3.4 generation of electricity Flashcards
(11 cards)
what may happen if light falls upon a certain semiconductor
it may cause separation and therefore generate electricity
what does semiconductors conductivity depend on
the rate at which the crystal bonds are broken
Thermal energy stored in a material may be transferred directly to electrical energy in a circuit by making use of what
the thermoelectric effect
Rubbing an insulator causes electrical charges to separate and is a source of
EMF
what is the voltage generated by friction
up to thousands of volts
when can static electricity be generated
whenever two materials contact or separate and at least one is a poor conductor of electricity
how can pressure be used to generate voltage
by using it to deform a piezo crystal
When can static electricity be generated
Whenever two materials contact or separate and at least one is a poor conductor
What is the operating principles of all generators called
Generator principle
What does the induced voltage increases in proportion with
The magnetic field strength, movement speed and the effective length of the conductor
What is the principal behind electrical generators, magnification pick up devices and moving coil microphones
Electromagnetic induction
