#4.2.2a
potential difference (p.d.); the unit volt
#4.2.2b
electromotive force (e.m.f.) of a source such as a cell or a power supply
Epsilon is used as the symbol for e.m.f. to avoid confusion with E which is used for energy and electric field. The ASE guide ‘Signs symbols and systematics’ details E as the correct symbol for e.m.f. and this will be credited in all examinations.
#4.2.2c
distinction between e.m.f. and p.d. in terms of energy transfer
#4.2.2d
energy transfer; \(W = VQ\); \(W = εQ\)
#4.2.2e
energy transfer \(eV = \dfrac{1}{2}mv^2 \) for electrons and other charged particles.