The phase angle between the voltage and the current in an AC circuit consisting of a resistance is______________?
Correct answer: A. Zero
- A. Zero
- B. 45°
- C. 90°
- D. 180°
Explanation
For a pure resistance, the voltage and current rise and fall together, so their phase difference is 0°. This follows from v = iR at every instant, with R in ohms, v in volts, and i in amperes. The common mistake is choosing 90°, which is the phase difference for a pure inductor or capacitor.
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About AC Through Resistor, Capacitor and Inductor
Alternating current through a resistor, capacitor and inductor involves phase relationships between voltage and current, reactance, impedance and energy transfer. A resistor keeps voltage and current in phase, while a capacitor and inductor produce opposite phase shifts, a distinction used in circuit diagrams and numerical calculations.
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