4.1 Charge and Current Flashcards
1
Q
Define current
A
Rate of flow of charge
2
Q
Define charge
A
A physical quantity, positive or negative, caused by presence/absence of electrons
3
Q
What is the elementary charge
A
1.60x10^-19
4
Q
List some charge carriers
A
Free moving electrons in metals
Free moving ions in electrolysis
5
Q
What is conventional current
A
Pos->neg, opposite to electron movement, all sys have conv. current unless otherwise stated
6
Q
What is Kirchoff’s first law
A
All the current going into one point of a circuit = all the current going out
7
Q
Define mean drift velocity & provide it’s equation
A
The average velocity of electrons travelling down a wire as they collide w/ pos metal ions
I=Anev
