Question

Explain term impedance and state the formula for it in the case of an LCR series circuit.

Answer 1

(i) The ratio of rms voltage to the rms value of current is called impedance. The SI unit of impedance is the ohm (Ω).

(ii) The formula for impedance in case of an LCR series circuit,

Z = `sqrt("R"^2 + ("X"_"L" - "X"_"C")^2)`

Where, R= Resistance,

X_L= Inductive reactance,
X_C = Capacitive reactance.