3.1 Flashcards
What 4 effects does electricity cause?
Heat
Magnetic action
Light
Chemical reaction
What is the structure for metals?
Close packed and have crystal lattice.
What does a high density for metal structure allow?
Allows electrons to move freely and jump between atoms.
What makes a metal a good conductor?
High mobility of electrons.
Generally, how many electrons do good conductors have on the outer shell?
Less than 4
What is the outer orbit called?
Valence orbit.
What is doping?
Adding foreign atoms for increased conductivity.
How can conductivity be increased?
Doping, heat or light.
How many electrons do insulators have on their outer orbit?
More than 4.
No free electrons
How is electricity produces?
Electrons moving away from their atom.
What charge is the atom if there are more electrons than protons and neutrons?
Negative.
What are positively or negatively charged atoms called?
Ions
What is a charged atom said to be?
Ionised
How much voltage must it take to move electrons away from their atom in insulators?
More than 3V.
How much voltage must it take to move electrons from their atom in conductors?
No voltage. Move freely.
