A-Level Physics OCR A H556

4.1.2: Mean drift velocity

#4.1.2a

mean drift velocity of charge carriers

#4.1.2b

$I = Anev$ , where n is the number density of charge carriers

#4.1.2c

distinction between conductors, semiconductors and insulators in terms of n.

4.1.1

Charge

4.2.1

Circuit symbols