Final answer:
The impedance of the given element is equal to its resistance, so the element is a resistor.
Step-by-step explanation:
The impedance of an element is represented by the symbol Z and is a measure of the opposition to the flow of electric current in an AC circuit. It is calculated using the formula Z = R, where R is the resistance of the element.
Therefore, if the impedance of an element is given as z=5 (Ω), then the element is a resistor, as the impedance is equal to the resistance.
A resistor is a circuit element that provides a known resistance and dissipates power in the form of heat when an electric current flows through it.