A-Level Physics OCR A H556

4.1.1: Charge

#4.1.1a

electric current as rate of flow of charge; $I = \dfrac{ΔQ}{Δt}$

#4.1.1b

the coulomb as the unit of charge

#4.1.1c

the elementary charge e equals 1.6 × 10^–19 C

Learners will be expected to know that an electron has charge –e and a proton a charge +e.

#4.1.1d

net charge on a particle or an object is quantised and a multiple of e

#4.1.1e

current as the movement of electrons in metals and movement of ions in electrolytes

#4.1.1f

conventional current and electron flow

#4.1.1g

Kirchhoff’s first law; conservation of charge.

3.5.2

Collisions

4.1.2

Mean drift velocity