Impedance in a circuit is measured in which unit and represented by which symbol?

Impedance is a vital concept in electrical engineering, particularly in the study of alternating current (AC) circuits. It is defined as the total opposition that a circuit offers to the flow of alternating current. The unit of measurement for impedance is the ohm, which is symbolized by the Greek letter Z.

The significance of understanding impedance lies in its components: it not only accounts for the resistance in the circuit but also incorporates reactance due to inductors and capacitors. This makes it crucial in analyzing how circuits behave with AC signals, as opposed to direct current (DC) where only resistance is considered.

The other options represent different electrical quantities. For example, watts measure power, volts measure electric potential, and amperes measure current. None of these terms relate to the concept of impedance, which is why they are not applicable in this context.

Recognizing that impedance is specifically measured in ohms and represented by the symbol Z is fundamental for further studies in circuit analysis and understanding electrical systems.