What is impedance?

Hint: In an electrical circuit, resistance is a measure of the resistance to current flow. The Greek letter omega (\[\Omega \]) is used to represent resistance in ohms. Georg Simon Ohm (1784-1854), a German physicist who investigated the relationship between voltage, current, and resistance, is the name given to Ohms.

Complete answer:
Impedance (symbol Z) is a measurement of a circuit's total resistance to current, or how much it obstructs the flow of charge. It's similar to resistance, but it also takes capacitance and inductance into account. Ohms are the unit of measurement for impedance (ohm).
Since the consequences of capacitance and inductance correlate with the frequency of the current flowing through the device, impedance differs with frequency, it is more complicated than resistance. Resistance has the same influence regardless of frequency.
Impedance is divided into two categories:
R is for resistance (the part which is constant regardless of frequency).
Reactance X (the part which varies with frequency due to capacitance and inductance).

Resistance (R), capacitance (C), inductance (L), and frequency (f)are the four electrical quantities that specify a circuit's impedance (Z).
Electrical impedance is the measurement of a circuit's resistance to current when a voltage is applied in electrical engineering.
The ratio of the complex representation of the sinusoidal voltage between its terminals to the complex representation of the current flowing through it is the impedance of a two-terminal circuit part. In general, it is determined by the sinusoidal voltage's frequency.
In contrast to resistance, which only has magnitude, impedance applies the principle of resistance to alternating current (AC) circuits and has both magnitude and phase.

Note:
Since it requires a basic linear law to relate sinusoidal voltages and currents, the concept of impedance is useful for conducting AC analysis of electrical networks. The two-terminal concept of impedance is insufficient in multiple port networks, but the impedance matrix also linearly relates the dynamic voltages at the ports and the currents flowing through them. Admittance is the inverse of impedance, and its SI unit is the Siemens, formerly known as the mho.