Blood is purely resistive while muscle has both resistive and capacitive properties.
If the load is purely resistive, the two quantities reverse their polarity at the same time.
Though a speaker is not purely resistive, these equations are often used to approximate power measurements for such a system.
The impedance would normally be specified to be constant and purely resistive.
This causes the load seen by the power line to be purely resistive.
The characteristic impedance of a lossless transmission line is purely resistive, with no reactive component.
The imaginary term j has also canceled out, making Z a real expression, and so is purely resistive.
In the case of purely resistive circuits, the two concepts are identical.
See purely resistive thermal circuits for an example of such a network.
As can be seen from the expression, this impedance is purely resistive.