Answer: 50 Hz.
- A 50 Hz
- B 60 Hz
- C 100 Hz
- D 25 Hz
Correct answer: A. 50 Hz
Explanation: India uses 50 Hz AC supply at 230 V (RMS). The USA uses 60 Hz at 120 V.
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.