Valero Mechanical Aptitude Practice Test

Impedance is measured in which unit?

Volts Watts Ohms Amperes

Correct Answer:

Ohms

Explanation:

Impedance is the opposition a circuit offers to alternating current, combining resistance and reactance. Its unit is the ohm (Ω). An ohm is defined as one volt per ampere, so the magnitude of impedance is V divided by I, expressed in ohms. In contrast, volts measure voltage, watts measure power, and amperes measure current. In AC circuits, impedance is a complex quantity Z = R + jX, but its magnitude is still read in ohms.

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