Which statement is incorrect?
- ACurrent is the speed of the charged particles that carry it.
- BElectromotive force (e.m.f.) is the energy converted to electrical energy from other forms, per unit charge.
- CThe potential difference (p.d.) between two points is the work done in moving unit charge from one point to the other.
- DThe resistance between two points is the p.d. between the two points, per unit current.