Physics 14 SMC H.-F. Lai Homework Solutions Ch. Protons in a metal wire cannot move freely because they are confined in the nuclei of atoms, which are fixed in the lattice of a solid metal. On the other hand, one or more electrons, called conduction electrons, in each metal atom are relatively loosely bound and can move easily when a voltage is applied across the wire. Batteries and electric generators are two common voltage sources.
Water flows more easily through a wide pipe.
Electric current flows more easily through a thick wire. If the voltage stays the same while the resistance doubles, then the current decreases to half. I ori . If the voltage decreases to half while the resistance remains the same, then the current decreases to half. I ori .