A-Level Physics Specification

OCR A H556

Section 4.1.1: Charge

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#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.