impedance
quotient of the voltage phasor and the electric current phasor
characteristic impedance
ratio of the amplitudes of voltage and current of a single wave propagating along the line
output impedance
measure of the opposition to current flow, both static and dynamic, into the load network being connected that is internal to the electrical source
input impedance
measure of the opposition to current, both static and dynamic, into the load network that is external to the electrical source
burden
kind of impedance in electronics