As series resonance in L.C.R circuit, the impedance is equal to:
Correct answer: B. Ohmic resistance
- A. Inductive reactance
- B. Ohmic resistance
- C. Capacitive reactance
- D. None of these
Explanation
Reactances resist currents without dissipating power, unlike resistors. Inductive reactance increases with frequency and inductance. Capacitive reactance decreases with frequency and capacitance. Impedance represents total opposition provided by reactance and resistance.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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