Answer: 7.07 A.
- A 5 A
- B 7.07 A
- C 10 A
- D 14.1 A
Correct answer: B. 7.07 A
Explanation: I<sub>rms</sub> = I₀/√2 = 10/1.414 ≈ 7.07 A.
In a pure inductor the current lags the voltage by 90° (energy is briefly stored in the magnetic field before current responds); in a pure capacitor the current leads the voltage by 90° (current must flow to build up charge before voltage rises) - the mnemonic "ELI the ICE man" keeps these straight.
Concept context
AC circuits, impedance, LCR series circuit, resonance, transformers, and power factor.