current electricity Flashcards
1
Q
current
A
rate of flow of electric charge, given by I=Q/t
2
Q
emf
A
work done by an electrical source in driving a unit charge around a complete circuit, given by ϵ=W/Q
3
Q
potential difference
A
work done to drive a unit charge through the component, given by V=W/Q
4
Q
resistance
A
ratio of potential difference across a component to the current flowing through it, given by R=V/I
5
Q
resistivity
A
property of a material that measures of how strongly the material opposes current flow
6
Q
Ohm’s law
A
current passing through a metallic conductor is directly proportional to the potential difference across it, provided that temperature remains constant
