JAMB Physics 2024 Paper

Concept: Impedance is the total opposition that a circuit presents to the flow of alternating current.Explanation: Impedance combines both resistance ($R$) and reactance ($X$), which arises from capacitors and inductors in an AC circuit.It is commonly denoted by the symbol $Z$.The relationship is given by $Z = \sqrt{R^2 + X^2}$.Since both $R$ and $X$ are measured in ohms ($\Omega$), impedance is also measured in ohms ($\Omega$).This unit is the same as that used for ordinary resistance and reactance in circuit theory.Answer: The unit of impedance is Option A: $\Omega$ (ohm).