M3.1 Flashcards
what are the four effects of electricity?
- heat
- magnetic action
- light
- chemical action
How are the atoms arranged in metals?
Closed packed with a crystal lattice
Why do metals have a good conductivity?
High mobility of its electrons
How many electrons are on the outer shell of a good conductor?
Less than four
How many electrons are in the outer shell of a semi conductor?
Exactly four
What is doping?
Adding other foreign atoms by heat or light?
How many electrons are in the outer shell of an insulator?
More than four
How is matter broken down into atoms?
By use of chemicals
What charge are:
- protons
- electrons
- neutrons
- protons = positive
- electrons = negative
- neutrons = neutral
What is electric current?
The flow of electrons
What is a atoms charge if there is more protons than electrons?
Positively charged
What voltage is needed to remove electrons from an insulator?
More than 3 volts
What voltage is needed to remove electrons from a semi conductor?
Less than 3 volts
What voltage is needed to remove electrons from a conductor?
No voltage required
Are the number of protons in the nucleus the same as the number of electrons?
Yes
