At resonance in an R.L.C series A.C circuit, which is correct?
Correct answer: D. All of the above
- A. The impedance is minimum
- B. The voltage across the inductor (VL) can be greater than the applied voltage
- C. The voltage across the capacitor (VC) can be greater than the applied voltage
- D. All of the above
Explanation
At series resonance, impedance is at its minimum (Z=R), allowing maximum current. This large current can create very high voltages across the inductor (VL=IXL) and capacitor (VC=IXC), which can be much larger than the source voltage. Therefore, all statements are correct.
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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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