Power factor (cos) depends on
Correct answer: D. All of the above
- A. Inductance
- B. Capacitance
- C. Resistance
- D. All of the above
Explanation
The power factor (cos φ) in an AC circuit measures the phase difference between voltage and current, and it depends on the presence of inductance, capacitance, and resistance. Inductance and capacitance cause the current to lead or lag the voltage, respectively, affecting the phase angle. Resistance affects the real power consumed, thus influencing the power factor. Therefore, all these components collectively determine the power factor, making Option D the correct choice. Options A, B, and C are incorrect when considered individually because the power factor is not solely dependent on any one of these elements, but rather the interplay of all three.
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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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