Question
What is the unit of impedance?
Answer Options
- A) The volt
- B) The ampere
- C) The coulomb
- D) The ohm
Correct Answer: D
Explanation
Impedance is the total opposition a circuit or component presents to the flow of alternating current (AC). It is a more general concept than resistance because it combines two forms of opposition: pure resistance and reactance (opposition due to capacitance and inductance).
Since impedance is still a measure of total opposition to current flow, its unit is the same as the unit of resistance: the Ohm (\Omega). Antenna systems are typically designed to have a characteristic impedance of 50\text{ Ohms} (T9B02).
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