Impedance is the combined effect of:
Correct answer: B. Resistance and reactance
- A. Resistance and inductance
- B. Resistance and reactance
- C. Inductance and capacitance
- D. None of these
Explanation
Impedance in an AC circuit is the combined effect of resistance (which opposes the flow of current) and reactance (which accounts for the opposition to current flow due to inductive or capacitive effects). Together, resistance and reactance form the complex impedance of the circuit.
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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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592 free Alternating Current MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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