Summary Edexcel A Level Physics Student Book 1 - Unit 3 - Electric Circuits

Electric

Circuits

, ① Definitions
Current : Current is the rate of flow of chased
particles
Potential difference :
Energy transferred per unit charge between two
points
Ohrislaw Current V = IR
:
is
directly proportional to pd :

Power : Rate of transfer of energy
Ent :
Fergy trastered by a cell per coulomb of charge




② Current-Voltage graphs

hmic conduction
~

W
I




I
v




follows Ohn's law , straight line
through origin

Semiconductor disde
-




-
u




- v I




only allows current flow direction the threshold voltage
post
in one .