Choose the correct statement. In the case of AC circuit ohms law holds for_______________?
Correct answer: D. All of the above
- A. Peak values of voltage and current
- B. Effective values of voltage and current
- C. Instantaneous values of voltage and current
- D. All of the above
Explanation
A resistor obeys v = iR at every instant, and the same proportionality also holds between peak values and between RMS values. Thus Ohm's law applies to instantaneous, peak, and effective voltage and current for a linear resistor. Students may select b because RMS values are normally used in AC calculations, but that does not exclude the other forms.
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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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