Answer: 5 Hz.
- A 2 Hz
- B 5 Hz
- C 10 Hz
- D 50 Hz
Correct answer: B. 5 Hz
Explanation: Frequency equals rotations per second. Thus f = 300/60 = 5 Hz.
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.