Answer: 1.41 A.
- A 0.707 A
- B 1.41 A
- C 1.00 A
- D 3.54 A
Correct answer: B. 1.41 A
Explanation: For a purely resistive load, I<sub>rms</sub> = V<sub>rms</sub>/R = 70.7/50 = 1.414 A, approximately 1.41 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.