The ampere is defined in terms of

A. power dissipated in a wire of known length, cross-sectional area and resistivity.

B. potential difference across a resistance of known value.

C. number of electrons flowing past a point in a circuit in a given time.

D. force per unit length between parallel current-carrying conductors.

D

The majority of candidates chose the number of electrons flowing past a point in a given time
as the definition of the ampere when the correct answer is in terms of a force between parallel
currents.