Impedance is a measure of the opposition to the flow of alternating current (AC) in a circuit. It is a complex quantity that has both magnitude and phase. The magnitude of the impedance is measured in ohms and the phase is measured in degrees.
Impedance is important because it affects the power factor of a circuit. The power factor is a measure of how efficiently a circuit uses power. A low power factor can lead to higher energy costs and can also damage electrical equipment. Checking the impedance of a circuit is important for ensuring that the circuit is operating efficiently and safely.
