In case of AC circuit power loss in resistive circuit.
Correct answer: A. Must be positive
- A. Must be positive
- B. Never be positive
- C. May or may not be positive
- D. None
Explanation
In an AC circuit, power refers to the average rate of energy dissipation. In a purely resistive circuit, voltage and current are in-phase, meaning they reach their peak values simultaneously. This in-phase relationship ensures that the instantaneous power, calculated as P = VI, remains positive throughout the cycle. Resistors convert electrical energy into heat, a process that cannot result in negative power loss. Therefore, the power loss must be positive, making Option A correct. Options B and C are incorrect because they misinterpret the nature of power loss in resistive circuits. Option D is incorrect as it fails to provide any relevant information about power loss in such circuits.
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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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